update model specs
update specs with .class_name
rename article_spec
add author_id to articles table
add article-author association
add associations for comments => commenter
add voter_id to votes
add association vote => voter_id
update validation for votes
update controller specs
add user factory
update articles_controller vote to include user id
Merge pull request #26 from ospreys-2014/add_associations_xiran

Add associations xiran