switching to Ruby 2.1.2

- 2.1.2 is recommended on Heroku:
  https://devcenter.heroku.com/changelog-items/468

- `debugger` gem does not build on 2.1.2; switching to `byebug`
   `bye bug` is the recommended debugger for current Ruby + Rails (see cldwalker/debugger#125 (comment) and rails/rails#14533)

- The following commands may help in switching your local version (assuming you use rbenv):

	rbenv install 2.1.2
	rbenv local 2.1.2
	gem install bundler
	bundle

.ruby-version

@@ -1 +1 @@
-2.1.1
+2.1.2

Gemfile

@@ -1,12 +1,12 @@
 source 'https://rubygems.org'
 
-ruby '2.1.1'
+ruby '2.1.2'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '4.0.2'
 
 group :development, :test do
   gem 'awesome_print'
-  gem 'debugger'
+  gem 'byebug'
   gem 'rspec-rails', '2.14.2'
   gem 'shoulda-matchers', '2.6.1'
 end
@@ -68,5 +68,3 @@ gem 'unicorn'
 # Use Capistrano for deployment
 # gem 'capistrano', group: :development
 
-# Use debugger
-# gem 'debugger', group: [:development, :test]

Gemfile.lock

@@ -30,6 +30,10 @@ GEM
     arel (4.0.2)
     awesome_print (1.2.0)
     builder (3.1.4)
+    byebug (3.5.1)
+      columnize (~> 0.8)
+      debugger-linecache (~> 1.2)
+      slop (~> 3.6)
     capybara (2.1.0)
       mime-types (>= 1.16)
       nokogiri (>= 1.3.3)
@@ -48,12 +52,7 @@ GEM
     columnize (0.8.9)
     dbf (2.0.7)
       fastercsv (~> 1.5.4)
-    debugger (1.6.8)
-      columnize (>= 0.3.1)
-      debugger-linecache (~> 1.2.0)
-      debugger-ruby_core_source (~> 1.3.5)
     debugger-linecache (1.2.0)
-    debugger-ruby_core_source (1.3.5)
     diff-lcs (1.2.5)
     erubis (2.7.0)
     execjs (2.2.1)
@@ -158,6 +157,7 @@ GEM
       websocket (~> 1.0.4)
     shoulda-matchers (2.6.1)
       activesupport (>= 3.0.0)
+    slop (3.6.0)
     sprockets (2.11.0)
       hike (~> 1.2)
       multi_json (~> 1.0)
@@ -191,9 +191,9 @@ PLATFORMS
 DEPENDENCIES
   activerecord-postgis-adapter (= 0.6.5)
   awesome_print
+  byebug
   capybara (= 2.1.0)
   coffee-rails (= 4.0.1)
-  debugger
   factory_girl_rails (= 4.2.1)
   faraday
   faraday_middleware