add comment_spec.rb
add rspec config for FactoryGirl Syntax
add factory for Comment
add invalid_comment to factory
add specs for testing Comment validations
Merge pull request #1 from ospreys-2014/article_test_xiran_aj

Article test xiran aj
add migration for comments
remove uncorrect user of :invalid_comment in factory
fix specs for comment invalidation
add Comment model
add Shoulda Matcher gem
add validation for Comment text field
refactored rspec test with Shoulda Gem
Merge pull request #2 from ospreys-2014/comment-model-xiran

Comment model xiran
add comments_controller_spec.rb
add Get specs for CommentsController
add back :invalid_comment factory
add Post specs for CommentsController
add PUT specs for CommentsController
add Delete specs for CommentsController