Add HLSTextView (text view with optional placeholder label). Add corresponding demo
Add a small bit of documentation
Modernize code
Merge branch 'feature/text-view' into develop

Conflicts:
	CoconutKit-demo/CoconutKit-demo.xcodeproj/project.pbxproj
	CoconutKit-demo/Sources/DemosNavigator/DemosListViewController.m
	CoconutKit-demo/en.lproj/Localizable.strings
	CoconutKit-demo/fr.lproj/Localizable.strings
	CoconutKit-dev/CoconutKit-dev.xcodeproj/project.pbxproj
	CoconutKit-test/CoconutKit-test.xcodeproj/project.pbxproj
	CoconutKit/CoconutKit.xcodeproj/project.pbxproj
Fix translation
Make text views scroll automatically