HACK: update to functional version of bootstrap-sass

The version referenced here was pulled from rubygems because it had a security backdoor. See twbs/bootstrap-sass#1195 for full details. This hack is a quick fix to make `bundle install` work again on a fresh install.

Author: rahulbot

Gemfile.lock

@@ -32,7 +32,7 @@ GEM
     bcrypt (3.1.10)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
-    bootstrap-sass (3.2.0.2)
+    bootstrap-sass (3.2.0.4)
       sass (~> 3.2)
     builder (3.1.4)
     capybara (2.6.2)