Add Hours/bindEnglishTo and fix for words being zero

[WadeTheFade]

resolves #3 and adds #5 and #6

I got it working, but was unable to resolve the testing.

Merging to develop in case someone can address before I get a chance.

[WadeTheFade]

I've found an issue with bindEnglishTo when selecting different scheduleTypes.

There are a few different approaches to fixing.. my first impression is to only call toEnglishString() is validate passes.

I'll try to address this and the failing checks in the next commit.

[kingofzeal]

This looks good.

Would it be possible to get some unit tests wired up to test the new hourly options as well? I would want to make sure that especially the cron output is what we would expect for a given combinations of options (and vice versa, a provided cron string updates the DOM with the correct options).

[WadeTheFade]

Yeah there is a bug in the monthly/yearly selection when bindEnglishTo() when loading a default schedule that isn't monthly/yearly:
Not implemented: Monthly.undefined.toEnglishString.

I'll try to address this and the unit tests around hourly soon