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Merge branch 'master' of https://github.com/lynneokada/Reddit-on-Rails

# By Morgan Chen (4) and lokada (3)
# Via Morgan Chen (3) and lokada (3)
* 'master' of https://github.com/lynneokada/Reddit-on-Rails:
  added comment partial to redditpost view, will sort by votes later
  added votes controller and partial
  added comment form to redditpost view, will update with ajax later
  list in redditpost partial removed
  preparing for pull
  polymorphic association: votes table added: votable_id and votable_type
  added validations that I forgot earlier