Quick & dirty iOS7 implementation

(a bit busy at the moment, more to come)
Fixed iOS 7 keyboard animation curve issue
Merge pull request #53 from paulheimann/master

Fixed iOS 7 keyboard animation curve issue
Revert iOS7 implementation; underwhelming functionality
Formatting/line spacing changes
More sensical recursive first responder search
Replace NSValue getters
Don't use the mainscreen's height if potentially on a different screen
Ditch string literals, use UIKit static variables; animation curve changes
Convert assigns to weaks
Get rid of method swizzling!
Update README
Handle keyboard being active during setup. Closes #56
Update podspec to 2.3.0
Adds the Autolayout support
Updates the podspecs
Merge pull request #63 from lucabartoletti/master

Adds the auto layout support
Only inject inputAccessoryView if textView is editable.
Use proper getter.
Merge pull request #67 from plu/master

Only inject inputAccessoryView if textView isEditable.