Merge pull request #8 from sleepers-anonymous/wakeup

Will actually fix off by foo error later, but shank timezones
Changes to make database timezone naive
Because I don't know strftime standards at all.
Adds ability to edit sleeps

[works, looks bad]
adds go back button
Adds buttons to go back to previous page on fail pages.
Show comments in sleep view
and truncates comments
Merge branch 'master' into wakeup

Conflicts:
	sleep/models.py