updated gitignore and added rake 0.8.7 to Gemfile because of errors

.gitignore

@@ -20,3 +20,6 @@ config/database.yml
 config/initializers/omniauth.rb
 config/unicorn.rb
 db/data.yml
+.idea
+.DS_Store
+

Gemfile

 source "http://rubygems.org"
 gem "rails", "3.2.5"
+gem "rake", "0.8.7"
 # Supported DBs
 gem "sqlite3"

Gemfile.lock

@@ -263,7 +263,7 @@ GEM
       rdoc (~> 3.4)
       thor (>= 0.14.6, < 2.0)
     raindrops (0.9.0)
-    rake (0.9.2.2)
+    rake (0.8.7)
     raphael-rails (1.5.2)
     rdoc (3.12)
       json (~> 1.4)
@@ -410,6 +410,7 @@ DEPENDENCIES
   pygments.rb!
   rails (= 3.2.5)
   rails-footnotes
+  rake (= 0.8.7)
   raphael-rails (= 1.5.2)
   redcarpet (~> 2.1.1)
   resque (~> 1.20.0)