UX much closer to Android Gmail experience

• collapse field to one line when it loses focus
• allow users to click to select or delete tokens
• properly complete token when , is entered
• handle enter, dpad center and tab to complete tokens or select the next field as appropriate
• properly restore view state when activity is saved and restored
• add an optional prefix prompt to the view
• add ability to programmatically add and remove objects to pre-fill and filter the field
• many bug fixes