Pylons/deform — pull request #251 by jinty (2014-12-16 21:27:10+00:00)
Title: Have the button css_class override the default button class

Deform sets btn-default and btn-primary automatically,
but this doesn’t work nicely if you want to use different
buttons (i.e. btn-warning or btn-dnager).

This is a backward-incompatible change, hopefully
still something allowed in an alpha version.