Update Turbolinks, load additional assets only on request, fix JS

Signed-off-by: Sebastian Serth <Sebastian.Serth@student.hpi.de>

Gemfile.lock

@@ -76,8 +76,8 @@ GEM
     bootstrap_pagedown (1.1.0)
       rails (>= 3.2)
     builder (3.2.3)
-    bunny (2.11.0)
-      amq-protocol (~> 2.3.0)
+    bunny (2.12.0)
+      amq-protocol (~> 2.3, >= 2.3.0)
     byebug (10.0.2)
     capistrano (3.11.0)
       airbrussh (>= 1.0.0)
@@ -99,7 +99,7 @@ GEM
       capistrano (~> 3.7)
       capistrano-bundler
       puma (~> 3.4)
-    capybara (3.7.2)
+    capybara (3.8.2)
       addressable
       mini_mime (>= 0.1.3)
       nokogiri (~> 1.8)
@@ -116,13 +116,6 @@ GEM
     codeclimate-test-reporter (1.0.8)
       simplecov (<= 0.13)
     coderay (1.1.2)
-    coffee-rails (4.2.2)
-      coffee-script (>= 2.2.0)
-      railties (>= 4.0.0)
-    coffee-script (2.4.1)
-      coffee-script-source
-      execjs
-    coffee-script-source (1.12.2)
     concurrent-ruby (1.0.5)
     crass (1.0.4)
     d3-rails (5.5.0)
@@ -171,9 +164,6 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    jquery-turbolinks (2.1.0)
-      railties (>= 3.1.0)
-      turbolinks
     json (2.1.0)
     jwt (1.5.6)
     kramdown (1.17.0)
@@ -308,7 +298,7 @@ GEM
       rspec-mocks (~> 3.8.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.0)
-    rubocop (0.59.1)
+    rubocop (0.59.2)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.5, != 2.5.1.1)
@@ -324,7 +314,7 @@ GEM
       json (~> 2.1)
       structured_warnings (~> 0.3)
     rubyzip (1.2.2)
-    sass (3.5.7)
+    sass (3.6.0)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -371,8 +361,9 @@ GEM
     thor (0.20.0)
     thread_safe (0.3.6)
     tilt (2.0.8)
-    turbolinks (2.5.4)
-      coffee-rails
+    turbolinks (5.2.0)
+      turbolinks-source (~> 5.2)
+    turbolinks-source (5.2.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
     uglifier (4.1.19)
@@ -427,7 +418,6 @@ DEPENDENCIES
   ims-lti (< 2.0.0)
   jbuilder
   jquery-rails
-  jquery-turbolinks
   kramdown
   listen
   mnemosyne-ruby
@@ -457,7 +447,7 @@ DEPENDENCIES
   sorcery
   spring
   tubesock!
-  turbolinks (< 5.0.0)
+  turbolinks
   uglifier
   web-console
   whenever