Fix support for Compass 0.12

[rmm5t]

Compass removed compass/css3/gradient and even though fancy-buttons no longer uses the deprecated syntax in that file, it was still being imported by fancy-buttons.

I bumped the Gemfile.lock file too, but only to ensure Compass 0.12 usage.

Aside, a Gemfile.lock file shouldn't be pushed to a gem's repository. See http://yehudakatz.com/2010/12/16/clarifying-the-roles-of-the-gemspec-and-gemfile/

[chriseppstein]

+1

[cokron]

running into this problem as well. I appreciate this pull request! Thanks, rmm5t

[manuelmeurer]

+1