Until and Since now limit date input
Until only allows future dates, since only allows past dates
Merge pull request #3 from petems/pm_stop_incorrect_usage

Until and Since now limit date input
Whitespace
Add `christmas` command spec
Add `christmas` middleware sequence
Copy paste error from since, improve names
Change timecop to 1.8.7 compatible
Dont allow 1.8.7 failures
Sigh, UTF-8 funtimes...
Change to 0.6.1 version of timecop (1.8.7 support)
More UTF8 fun to christmas
Move 1.8.7 back to allow fail

Cant be bothered to fix some issues with next_month (specs fail, but actual code ok...)