Merge pull request #18 from ashag/tumblr

Tumblr
made uid a string in exist? method
lowered limit on post model
fix boolean error in find_or_create_post
dumped my schema
Refactored TwitterFeed methods
testing uid to tring on following? method
changed user_array to tweet-link in TwitterFeed model
deleted a singular space... .
Merge pull request #19 from ashag/tumblr

refactor tumblr feed methods
Merged tumblr_feed conflicts
formatting of tumblr responses