Settings Only - File selection and options integration

Manage URL - http://goo.gl/fNi1vy

@donnapep @dlugo00 @mmeiers 
The Settings of this widget are fairly involved, so to make reviewing easier this is only a review of the first part:
- URL Data field (includes validations since DDE is not in this iteration)
- Google Picker (with authorization) integration to select a spreadsheet
- URL options (Cells, Range, Worksheet, Header Rows)
- Saving and retrieving these settings