Attempt to fix sass/sassc-ruby#146

Gemfile

@@ -18,7 +18,7 @@ gem 'scenic'
 
 # UI, assets
 gem 'coffee-rails', '~> 4.2'
-gem 'sass-rails', '~> 5.0'
+gem 'sassc-rails', '~> 2.1.2'
 gem 'sprockets',  '~> 3.7.2'
 gem 'turbolinks', '~> 5'
 gem 'uglifier', '>= 1.3.0'

Gemfile.lock

@@ -185,7 +185,7 @@ GEM
       railties (>= 3.0.0)
     faraday (0.15.2)
       multipart-post (>= 1.2, < 3)
-    ffi (1.12.2)
+    ffi (1.15.4)
     formtastic (3.1.5)
       actionpack (>= 3.2.13)
     formtastic_i18n (0.6.0)
@@ -346,18 +346,7 @@ GEM
     ruby_dep (1.5.0)
     rubyzip (1.3.0)
     safe_yaml (1.0.4)
-    sass (3.7.4)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-    sass-rails (5.0.7)
-      railties (>= 4.0.0, < 6)
-      sass (~> 3.1)
-      sprockets (>= 2.8, < 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
-      tilt (>= 1.1, < 3)
-    sassc (2.2.1)
+    sassc (2.1.0)
       ffi (~> 1.9)
     sassc-rails (2.1.2)
       railties (>= 4.0.0)
@@ -479,7 +468,7 @@ DEPENDENCIES
   rspec-rails (~> 3.5)
   rubocop
   rubyzip
-  sass-rails (~> 5.0)
+  sassc-rails (~> 2.1.2)
   scenic
   selenium-webdriver
   sidekiq (>= 6.1.0)