cleaned up forms so that only one form is used for creation/edit posts.
created models and migrations for comments to be used on both posts and answers.
comments are now set up with polymorphic association to answers and posts. Added links to create comments that uses separate paths for same form.
fixed bugs in comment form. Comments can now be created. If body not present throws flash notice.
fixed a bug in new post creation. Post show page now displays comments.
post show page now displays comments on individual answers.
fixed merge conflicts.
Merge pull request #22 from alexcodreanu86/comments

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