Added KVO concept to adjust the input text view frame.
Fix the new line visible issue in iOS 7.
Send button enable check moved to textview didchange.
1. Code alignments as per
https://github.com/jessesquires/MessagesTableViewController#how-to-contr
ibute
2. Safely removed the KVO observer.
Merge pull request #82 from MallowDev/master

Added KVO concept to adjust the input text view frame.