Remove constants and expose styling

[dmorrow]

I've exposed a number of properties on CLTokenInputView to enable better customization. All of the properties exposed were previous handled by constants. These include: padding (PADDING_*),fieldPadding, standardRowHeight, textFieldHSpace, linePadding (VSpace), minimumTextFieldWidth, tokenPadding

To allow for text styling without exposing the actual fields, there are now options for NSAttributedText attributes and NSAttributedStrings where needed. attributedFieldName, attributedPlaceholderText, defaultTextAttributes, selectedTextAttributes, placeholderTextAttributes

[dmorrow]

@rsattar Any thoughts?

[mciarlo]

Would love to see this get merged :) cc @rsattar

[PlayDevelop]

Would also love to see this merged.

[mindgrub-rkoch]

Any chance this can get merged in?