Scheduled jobs are now scored with UTC unix time.
Return a timezone correct date when using with_times=True.

Now the response of with_times will match the timezone (UTC) of ended_at,
created_at, and enqueued_at.
Merge pull request #30 from kwilcox/utc-time

Return a timezone correct date when using with_times=True.
Merge branch 'master' into utc-time
replace times with utcnow, utcformat, from_unix, to_unix
move from_unix and to_unix to utils file
Merge pull request #36 from michaelbrooks/utc-time

utc and time parsing and formatting support