Major UI and usage improvements

Special thanks to @wdullaer on this release for their awesome work in pull request #90 on this one.

New features

• setSplitChar will let you change or add multiple characters to complete on
• performBestGuess(false) will disable guessing (based on the suggestions adapter)
• When losing focus, the field will tokenize any remaining input if it is longer than setThreshold
  • Please give feedback here! Maybe it should just complete input always when losing focus?
• clear will remove all tokens in the field

Bug fixes

• It no longer takes 2 taps to show the keyboard
• Improved behavior on collapsing to one line
• Respect maxLines in XML (while still collapsing on focus loss)
• Respect ime actions set in XML (no more hardcoded done, no return button)
• Prevent extract UI in landscape, which doesn't show the token spans
• The +x count now correctly updates when the field is not focused