make hashtags into links when loading tweets for infinite scroll
Merge pull request #39 from anirudh-eka/make_hashtags_link_with_infinite_scroll

make hashtags into links when loading tweets for infinite scroll
add quick refactoring in the controller
added youtube video helpers for twitter. all helper methods in add_post_links are now receiving and returning Post object
for twiter, fixed links for multiple hashtags that contain another hashtag
removing t.co link (to Twitter post) in text that appears when  an image is shared
changed name for sample tweet that's used to test stripping image url
for twitter, replaced t.co links that represent youtube urls and embedded youtube videos.
modify censoring to be optional by no requiring the key to be listed in the environment
update documentation
make twitter and gram optional by putting key in the environment variable and no value
fixed bug with not rendering instagram text when it contains youtube link. added test to cover bug
no longer rendering link for hashtags that are truncated. reorganized post helper tests.
for twitter, no longer rendering link for usernames that are truncated
for twitter, embedded vine videos for direct vine urls in tweet text
resized embedded vine videos for tweets
merged from parent