ReplyTextView enhancements

- Nukes a workaround in ReplyTextView, meant to match the Keyboard Animation
- Fixed a glitch that was causing the internal TextView to "Jump" on iOS 8
- Disabled QuickType bar
- Implemented few Autolayout helpers

Fixes #2354
Fixes #2356 

Would this be a little more clear if we renamed the attribute values to something like, `firstItemAttribute` and `secondItemAttribute`?