Merge branch 'rs-bump-bootstrap-sass' into 'master'

Bump bootstrap-sass to ~> 3.3.0

Resolves bootlint error:

`bootlint:  W013  Bootstrap version might be outdated. Latest version is at least 3.3.6 ; saw what appears to be usage of Bootstrap 3.3.5`

See merge request !2275

Gemfile

@@ -200,7 +200,7 @@ gem 'turbolinks', '~> 2.5.0'
 gem 'jquery-turbolinks', '~> 2.1.0'
 
 gem 'addressable',        '~> 2.3.8'
-gem 'bootstrap-sass',     '~> 3.0'
+gem 'bootstrap-sass',     '~> 3.3.0'
 gem 'font-awesome-rails', '~> 4.2'
 gem 'gitlab_emoji',       '~> 0.2.0'
 gem 'gon',                '~> 6.0.1'

Gemfile.lock

@@ -66,7 +66,7 @@ GEM
     attr_encrypted (1.3.4)
       encryptor (>= 1.3.0)
     attr_required (1.0.0)
-    autoprefixer-rails (6.1.2)
+    autoprefixer-rails (6.2.3)
       execjs
       json
     awesome_print (1.2.0)
@@ -82,9 +82,9 @@ GEM
       erubis (>= 2.6.6)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
-    bootstrap-sass (3.3.5)
-      autoprefixer-rails (>= 5.0.0.1)
-      sass (>= 3.2.19)
+    bootstrap-sass (3.3.6)
+      autoprefixer-rails (>= 5.2.1)
+      sass (>= 3.3.4)
     brakeman (3.1.4)
       erubis (~> 2.6)
       fastercsv (~> 1.5)
@@ -843,7 +843,7 @@ DEPENDENCIES
   benchmark-ips
   better_errors (~> 1.0.1)
   binding_of_caller (~> 0.7.2)
-  bootstrap-sass (~> 3.0)
+  bootstrap-sass (~> 3.3.0)
   brakeman (~> 3.1.0)
   browser (~> 1.0.0)
   bullet