Revert raphael-rails in order to make network work correctly

Gemfile

@@ -104,7 +104,7 @@ group :assets do
   gem "jquery-rails",     "2.1.3"
   gem "jquery-ui-rails",  "2.0.2"
   gem "modernizr",        "2.6.2"
-  gem "raphael-rails",    "2.1.0"
+  gem "raphael-rails",    "1.5.2"
   gem 'bootstrap-sass',   "2.2.1.1"
   gem "font-awesome-sass-rails", "~> 2.0.0"
   gem "gemoji", "~> 1.2.1", require: 'emoji/railtie'

Gemfile.lock

@@ -335,7 +335,7 @@ GEM
       thor (>= 0.14.6, < 2.0)
     raindrops (0.10.0)
     rake (10.0.1)
-    raphael-rails (2.1.0)
+    raphael-rails (1.5.2)
     rb-fsevent (0.9.2)
     rb-inotify (0.8.8)
       ffi (>= 0.5.0)
@@ -502,7 +502,7 @@ DEPENDENCIES
   rack-mini-profiler
   rails (= 3.2.9)
   rails-dev-tweaks
-  raphael-rails (= 2.1.0)
+  raphael-rails (= 1.5.2)
   rb-fsevent
   rb-inotify
   redcarpet (~> 2.2.2)