Merge pull request #5 from trojjer/master

[Work In Progress, WIP]: Implementation of the full range of fields stated. I'm merging this now. You'll have to let me know if you have any more fields to add, and put them in a separate PR.
Clearer comment
Fixed Django 1.5 compatibility. NumberInput is new in 1.6, so we just attempt to import it.
Version bump
Merge pull request #6 from scott-w/master

Django 1.5 compatibility fix
Clearer description
Another stab at desc
Added clarification
Last polish!