Update make rules to run npm install if needed.
Fix Simplon references in copyright
Bumper: only parse options once
Bumper: implement selector option.
Move wildcard class removal code to utils
Bumper: (bump|unbump)-(add|remove) options.
Bumper: fix data naming conflict.
Bumper: list no options in docs
Bumper: extend documentation a bit.
Merge pull request #346 from Patternslib/bumper-extensions

Bumper: add more actions on (un)bump