carlhuda/bundler — pull request #1577 by nurse (2011-12-03 20:36:35+00:00)
Title: Prevent making useless symbols.

Groups are concatenated with ':' in Bundler::Settings#without=,
and splited by ':' in Bundler::Settings#without. So
* to_sym in Bundler::CLI#install is useless
* :-separated list is also allowed.