Simplify travis matrix

Drop all old puppets besides latest 3.x and 4.x.  Add a cell to run the
acceptance tests in docker.

.travis.yml

@@ -1,17 +1,21 @@
+---
+sudo: false
 language: ruby
-bundler_args: --without development
+before_install:
+  - gem update bundler
 script: "bundle exec rake spec SPEC_OPTS='--format documentation'"
-rvm:
-  - 1.8.7
-  - 1.9.3
-env:
-  - PUPPET_GEM_VERSION="~> 3.0.0"
-  - PUPPET_GEM_VERSION="~> 3.1.0"
-  - PUPPET_GEM_VERSION="~> 3.2.0"
-  - PUPPET_GEM_VERSION="~> 3.3.0"
-  - PUPPET_GEM_VERSION="~> 3.4.0"
-  - PUPPET_GEM_VERSION="~> 3.5.0"
-  - PUPPET_GEM_VERSION="~> 3.6.0"
-  - PUPPET_GEM_VERSION="~> 3.7.0"
+matrix:
+  fast_finish: true
+  include:
+    - rvm: 2.3.1
+      script: bundle exec kitchen test
+      services: docker
+      sudo: required
+    - rvm: 1.9.3
+      bundler_args: --without integration
+      env: PUPPET_GEM_VERSION="~> 3.0"
+    - rvm: 2.3.1
+      bundler_args: --without integration
+      env: PUPPET_GEM_VERSION="~> 4.0"
 notifications:
   email: false

Gemfile

@@ -12,7 +12,7 @@ group :development, :test do
   gem 'puppet-lint'
 end
 
-group :development do
+group :integration do
   gem 'test-kitchen'
   gem 'kitchen-docker'
   gem 'kitchen-inspec'