Allow model methods as slug source
MongoMapper defines indexes differently now.
Change filenames to avoid some deprecation warnings.
Automatically use the slug for generating URLs, and try finding with slug first.
Add force-option for regenerating the slug when the field it is based on changes.
Merge https://github.com/ryanlower/mm-sluggable

Conflicts:
	lib/mm-sluggable.rb
Remove whitespace
Merge remote-tracking branch 'burningTyger/master'

Conflicts:
	lib/mm-sluggable.rb
Check generated slug against a blacklist before accepting