Fixing error messages
Updating Issues file.
Prettyifying and fixing follow error retrys

* More Bootstrap
* not trying to follow people whom you've already requested (error 162)
Fixing big integer problem on twitter_id

* Added new dependency to rename columns
* Created migrations to change the twitter_id from int to string as suggested by Twitter API docs
* updated composer
Switching to bootstrap CSS text-danger
Merge branch 'errormessages'