removes doc from gemfile

Ref: #125

Gemfile

@@ -17,8 +17,7 @@ gem 'coffee-rails', '~> 4.1.0'
 gem 'jquery-rails'
 # Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
 gem 'turbolinks'
-# bundle exec rake doc:rails generates the API under doc/api.
-gem 'sdoc', '~> 0.4.0', group: :doc
+
 gem 'devise'
 # Use ActiveModel has_secure_password
 # gem 'bcrypt', '~> 3.1.7'

Gemfile.lock

@@ -204,7 +204,6 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rake (10.4.2)
-    rdoc (4.2.0)
     recaptcha (0.4.0)
     responders (2.1.0)
       railties (>= 4.2.0, < 5)
@@ -236,9 +235,6 @@ GEM
       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)
     simplecov (0.10.0)
       docile (~> 1.1.0)
       json (~> 1.8)
@@ -320,7 +316,6 @@ DEPENDENCIES
   responders
   rspec-rails (~> 3.0)
   sass-rails (~> 5.0)
-  sdoc (~> 0.4.0)
   spring
   turbolinks
   uglifier (>= 1.3.0)