Fix plugin to work with newer Google Spreadsheet API
Fix error on entering nothing for guest code
Standardize code styling and spacing
Reorganize code and make settings page look better
Make authorization section nicer, fix settings bugs
Add instructions, make settings page easier to understand
Change styling and wording on RSVP page
Arrange RSVP update entry into table style
Standardize naming to gdrsvp
Update documentation for 2.0
Merge pull request #1 from chunky56/master

Update for newer Google Spreadsheet API