add FLEXArgumentInputFontsPickerView, easily select fonts
add done button in FLEXArgumentInputTextView
fix issues on ios7
FLEXArgumentInputFontsPickerView never through FLEXArgumentInputViewFactory
modify code style
remove line break in method
avoid use magic number to alloc toolbar
Merge pull request #7 from DaidoujiChen/develop

Add font picker input view