New feature added: Google Calendar synchronization and unsync.

[brucegorman]

Added a new feature that allows users to update their calendars to google calendar.

[FinalGale]

Untrustworthy google dev account, causes a lot of pop up windows to confirm and proceed with google calendar sync

incorrectly exports each reoccurring event as a separate event
should not be same color for all different events

[brucegorman]

1. This account pull requested before and was approved. I was in the team. Go through the history first before you comment.
2. Worked perfectly for me. If incorrect put your image here. Treating each event separately makes sense to me.
3. Nobody said before that colors should be different.
4. You could delete this branch directly.