Update devDependencies, gems and lots of cleanup/build fixes.

* switch to grunt-postcss and autoprefixer directly; this is the recommended way.
* uglify: specify `ie8` for compatibility
* specify `cascade:false` for autoprefixer
* specify `ieCompat` for less
* drop grunt-contrib-compress since it doesn't work with Node.js 10.x
* remove grunt-contrib-htmlmin to match the v4 docs
* clean up Gruntfile.js
* clean up .travis.yml and backport changes from v4
* build ie10-viewport-bug-workaround.less since it's used in examples
* move shrinkwrap to root
* bs-commonjs-generator.js: Use `path.posix`
* remove .hound.yml
* remove references to no longer used PR bots
* backport and adapt the sri generation script from v4

.gitignore

@@ -37,5 +37,7 @@ Thumbs.db
 docs/.jekyll-metadata
 
 # Folders to ignore
+/.bundle/
 bower_components
 node_modules
+/vendor/

.travis.yml

@@ -1,45 +1,23 @@
-sudo: required
-dist: trusty
 language: node_js
 git:
-  depth: 10
+  depth: 3
 node_js:
   - "6"
+env:
+  matrix:
+    - TWBS_TEST=core
+    - TWBS_TEST=validate-html
+    - TWBS_TEST=browserstack
 before_install:
-  # Remove ./node_modules/.bin from PATH so node-which doesn't replace Unix which and cause RVM to barf. See https://github.com/travis-ci/travis-ci/issues/5092
-  - export PATH=$(python -c 'from sys import argv;from collections import OrderedDict as od;print(":".join(od((p,None) for p in argv[1].split(":") if p.startswith("/")).keys()))' "$PATH")
-  - rvm install 2.2
-  - rvm use 2.2 --fuzzy
   - "export TRAVIS_COMMIT_MSG=\"$(git log --format=%B --no-merges -n 1)\""
   - echo "$TRAVIS_COMMIT_MSG" | grep '\[skip validator\]'; export TWBS_DO_VALIDATOR=$?; true
-  - echo "$TRAVIS_COMMIT_MSG" | grep '\[skip sauce\]'; export TWBS_DO_SAUCE=$?; true
-  - if [ "$TRAVIS_REPO_SLUG" = twbs-savage/bootstrap ]; then export TWBS_DO_VALIDATOR=0; fi
+  - echo "$TRAVIS_COMMIT_MSG" | grep '\[skip browserstack\]'; export TWBS_DO_BROWSERSTACK=$?; true
 install:
-  - bundle install --deployment --jobs=1
-  - cp grunt/npm-shrinkwrap.json ./
+  - bundle install --deployment --jobs=3 --retry=3 --clean
   - npm install
-# Undo `_JAVA_OPTIONS` environment variable;
-# see https://github.com/travis-ci/travis-ci/issues/8408
-before_script:
-  - _JAVA_OPTIONS=
 cache:
   directories:
     - node_modules
     - vendor/bundle
-env:
-  global:
-    - NPM_CONFIG_PROGRESS="false"
-    - SAUCE_USERNAME="bootstrap"
-    - secure: "pJkBwnuae9dKU5tEcCqccfS1QQw7/meEcfz63fM7ba7QJNjoA6BaXj08L5Z3Vb5vBmVPwBawxo5Hp0jC0r/Z/O0hGnAmz/Cz09L+cy7dSAZ9x4hvZePSja/UAusaB5ogMoO8l2b773MzgQeSmrLbExr9BWLeqEfjC2hFgdgHLaQ="
-    - secure: "RKWpS+P20b4tG9tawzCMJSmQftoonmC7tJzyGYiHuEM1TcpHALLBcnzKlr/+DiPTfzDJWY4kS8pxfhK4uXOe8OHnhpMNub7LEWtFPePlZIervOJcsOydaQocTKqVVWD6OUubMeQmQ+tZmvmpjoJ1uPPEbFs9ciF7+dv3U5tLUZ0="
-    - secure: "XswSKBY0HJ/aO9VOBeWlvGpqSFF/DsJmNKz7o5RkJMJX340qe44J929uUNwwOwlv9YrgptzC2W6l8bpmZQV+p6IYs99SoSA8CCaUfIJaqeU9x/UiT5vIHgqaNax+vFJwvzHLpF5v/ggFqFEKCd54gCDasePLTztHeC4oL104iaQ="
-  matrix:
-    - TWBS_TEST=core
-    - TWBS_TEST=validate-html
-    - TWBS_TEST=browserstack
-matrix:
-  fast_finish: true
 notifications:
-  slack: heybb:iz4wwosL0N0EdaX1gvgkU0NH
-  webhooks:
-    - http://savage1.twbsapps.com/savage/travis
+  email: false

CONTRIBUTING.md

@@ -223,16 +223,6 @@ includes code changes) and under the terms of the
 [Creative Commons Attribution 3.0 Unported License](docs/LICENSE)
 (if it includes documentation changes).
 
-### Pull request bots
-
-[@twbs-rorschach](https://github.com/twbs-rorschach) is a Bootstrap bot that hangs out in our GitHub issue tracker and automatically checks all pull requests for a few simple common mistakes. It's possible that Rorschach might leave a comment on your pull request and then close it. If that happens, simply fix the problem(s) mentioned in the comment (there should be link(s) in the comment explaining the problem(s) in detail) and then either:
-
-* Push the revised version to your pull request's branch and post a comment on the pull request saying that you've fixed the problem(s). One of the Bootstrap Core Team members will then come along and reopen your pull request.
-* Or you can just open a new pull request for your revised version.
-
-[@twbs-savage](https://github.com/twbs-savage) is a Bootstrap bot that automatically runs cross-browser tests (via [Sauce](https://saucelabs.com) and Travis CI) on JavaScript pull requests. Savage will leave a comment on pull requests stating whether cross-browser JS tests passed or failed, with a link to the full Travis build details. If your pull request fails, check the Travis log to see which browser + OS combinations failed. Each browser test in the Travis log includes a link to a Sauce page with details about the test. On those details pages, you can watch a screencast of the test run to see exactly which unit tests failed.
-
-
 ## Code guidelines
 
 ### HTML

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
 group :development, :test do
-  gem 'jekyll', '~> 3.1.2'
-  gem 'jekyll-sitemap', '~> 0.11.0'
+  gem 'jekyll', '~> 3.8.5'
+  gem 'jekyll-sitemap', '~> 1.2.0'
 end

Gemfile.lock

@@ -1,37 +1,57 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.4.0)
-    colorator (0.1)
-    ffi (1.9.18)
-    ffi (1.9.18-x64-mingw32)
-    jekyll (3.1.6)
-      colorator (~> 0.1)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    colorator (1.1.0)
+    concurrent-ruby (1.1.3)
+    em-websocket (0.5.1)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0.6.0)
+    eventmachine (1.2.7)
+    eventmachine (1.2.7-x64-mingw32)
+    ffi (1.9.25)
+    ffi (1.9.25-x64-mingw32)
+    forwardable-extended (2.6.0)
+    http_parser.rb (0.6.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    jekyll (3.8.5)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      em-websocket (~> 0.5)
+      i18n (~> 0.7)
       jekyll-sass-converter (~> 1.0)
-      jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
-      liquid (~> 3.0)
+      jekyll-watch (~> 2.0)
+      kramdown (~> 1.14)
+      liquid (~> 4.0)
       mercenary (~> 0.3.3)
-      rouge (~> 1.7)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-    jekyll-sass-converter (1.5.0)
+    jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
-    jekyll-sitemap (0.11.0)
-      addressable (~> 2.4.0)
-    jekyll-watch (1.5.0)
-      listen (~> 3.0, < 3.1)
-    kramdown (1.14.0)
-    liquid (3.0.6)
-    listen (3.0.8)
+    jekyll-sitemap (1.2.0)
+      jekyll (~> 3.3)
+    jekyll-watch (2.1.2)
+      listen (~> 3.0)
+    kramdown (1.17.0)
+    liquid (4.0.1)
+    listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
     mercenary (0.3.6)
-    rb-fsevent (0.10.2)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (3.0.3)
+    rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
-    rouge (1.11.1)
+    rouge (3.3.0)
+    ruby_dep (1.5.0)
     safe_yaml (1.0.4)
-    sass (3.5.1)
+    sass (3.7.2)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -42,8 +62,8 @@ PLATFORMS
   x64-mingw32
 
 DEPENDENCIES
-  jekyll (~> 3.1.2)
-  jekyll-sitemap (~> 0.11.0)
+  jekyll (~> 3.8.5)
+  jekyll-sitemap (~> 1.2.0)
 
 BUNDLED WITH
-   1.15.3
+   1.17.2