made reply button not show up for users you are not following
made reply button show up for my own posts
added backend check to make sure you can't reply to a post unless you are following the author
fixed so that user must be a participant in the conversation (or follow the author, already implemented) in order to reply to a given post
Merge pull request #24 from philringsmuth/FIX_MustFollowToReply

Fix must follow to reply