Auto push/pull

[annejan]

Needs configuration options, I'm currently thinking.
[ ] automatically pull in updates [ ] automatically push changes

Possibly just one [ ] automatically synchronize option.
(Might get slow on pulling each time (network))
Possibly only synchronize on edits etc . . or those two options.

Perhaps hide the [Push] and [Update] buttons (and possibly rename push to [Upload] or something, since we did rename pull to [Update])