moved datatables back to cdn and precompiled assets

Gemfile.lock

@@ -62,11 +62,6 @@ GEM
     jbuilder (2.2.13)
       activesupport (>= 3.0.0, < 5)
       multi_json (~> 1.2)
-    jquery-datatables-rails (3.3.0)
-      actionpack (>= 3.1)
-      jquery-rails
-      railties (>= 3.1)
-      sass-rails
     jquery-rails (4.0.3)
       rails-dom-testing (~> 1.0)
       railties (>= 4.2.0)
@@ -131,13 +126,6 @@ GEM
     responders (2.1.0)
       railties (>= 4.2.0, < 5)
     round_robin_tournament (0.0.1)
-    sass (3.4.13)
-    sass-rails (5.0.3)
-      railties (>= 4.0.0, < 5.0)
-      sass (~> 3.1)
-      sprockets (>= 2.8, < 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
-      tilt (~> 1.1)
     sdoc (0.4.1)
       json (~> 1.7, >= 1.7.7)
       rdoc (~> 4.0)
@@ -154,7 +142,6 @@ GEM
       ref
     thor (0.19.1)
     thread_safe (0.3.5)
-    tilt (1.4.1)
     turbolinks (2.5.3)
       coffee-rails
     tzinfo (1.2.2)
@@ -173,7 +160,6 @@ DEPENDENCIES
   coffee-rails (~> 4.0.0)
   devise
   jbuilder (~> 2.0)
-  jquery-datatables-rails
   jquery-rails
   mysql2
   passenger