Remove teaspoon, update sprockets

Gemfile

@@ -63,9 +63,7 @@ gem 'airbrake', '~> 5.7.1'
 gem 'envyable', require: 'envyable/rails-now'
 gem 'webpack-rails'
 gem 'bootstrap-sass', '~> 3.3.5'
-# Sprockets 3 breaks Teaspoon.
-# see https://github.com/modeset/teaspoon/issues/443
-gem 'sprockets-rails', '< 3.0'
+gem 'sprockets-rails'
 gem 'compass-rails', '~> 3.0.2' # was using git master branch before
 gem 'sass-rails', '~> 5.0.6'
 gem 'uglifier', '>= 1.3.0'
@@ -80,8 +78,6 @@ group :development, :test do
   gem 'factory_girl_rails'
   gem 'faker'
   gem 'vcr'
-  gem 'teaspoon'
-  gem 'teaspoon-mocha'
   gem 'magic_lamp'
   gem 'spring-commands-rspec'
 end

Gemfile.lock

@@ -330,7 +330,7 @@ GEM
       cocaine (~> 0.5.5)
       mime-types
       mimemagic (~> 0.3.0)
-    parser (2.3.1.2)
+    parser (2.4.0.0)
       ast (~> 2.2)
     pg (0.18.4)
     phony (2.15.40)
@@ -394,7 +394,7 @@ GEM
       activesupport (= 4.2.8)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
-    rainbow (2.1.0)
+    rainbow (2.2.1)
     rake (11.3.0)
     ransack (1.8.2)
       actionpack (>= 3.0)
@@ -437,8 +437,8 @@ GEM
       rspec-mocks (~> 3.4.0)
       rspec-support (~> 3.4.0)
     rspec-support (3.4.1)
-    rubocop (0.41.2)
-      parser (>= 2.3.1.1, < 3.0)
+    rubocop (0.47.1)
+      parser (>= 2.3.3.1, < 3.0)
       powerpack (~> 0.1)
       rainbow (>= 1.99.1, < 3.0)
       ruby-progressbar (~> 1.7)
@@ -480,16 +480,12 @@ GEM
     sprockets (3.7.1)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-rails (2.3.3)
-      actionpack (>= 3.0)
-      activesupport (>= 3.0)
-      sprockets (>= 2.8, < 4.0)
+    sprockets-rails (3.2.0)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
     summernote-rails (0.8.1.1)
       railties (>= 3.1)
-    teaspoon (1.1.5)
-      railties (>= 3.2.5, < 6)
-    teaspoon-mocha (2.3.3)
-      teaspoon (>= 1.0.0)
     temple (0.7.7)
     term-ansicolor (1.4.0)
       tins (~> 1.0)
@@ -507,7 +503,7 @@ GEM
       thread_safe (~> 0.1)
     uglifier (3.0.0)
       execjs (>= 0.3.0, < 3)
-    unicode-display_width (1.1.0)
+    unicode-display_width (1.1.3)
     unicode_utils (1.4.0)
     vcr (3.0.3)
     warden (1.2.6)
@@ -617,10 +613,8 @@ DEPENDENCIES
   slim-rails (~> 3.1.1)
   spring
   spring-commands-rspec
-  sprockets-rails (< 3.0)
+  sprockets-rails
   summernote-rails
-  teaspoon
-  teaspoon-mocha
   terminal-notifier-guard
   timecop
   twilio-ruby