title text with attributes.

- adds titleTextAttributes property to cutomize the title text with a
  dictionary of character attributes.
- adds attributedTitle NSAttributedString property.
fix storyboard issues
Merge branch 'master' of https://github.com/nebiros/ActionSheetPicker-3.0 into nebiros-master
add spec
simplify statments
fix sizes for custom fonts
add example for custom font
add basic texts for attributed strings
Merge branch 'nebiros-master'