change placeholder from UILabel to UITextView
make placeholder adapt to textContainer's exclusionPaths
remove observer from kExclusionPaths
fixing removal of observer on textContainer
fixing tests
renaming attribute _placeholderLabel to _placeholderTextView
using constants for static key path variables
fixing constant name
changelog for 1.1.0
cleaning up old UILabel resizing cruft, ensuring backwards compatibility
storyboard meta data upgrade (xcode 5.0.2)