Reformat dice roller so single rolls use the "old" format
Finally remove duplicated dev gems
More formatting bugs fixed
Begin adding tests! Start with the Dice plugin.

This test spec was instrumental in fixing the formatting issues
introduced a few commits ago. Thanks go to samphippen in the
Freenode #rspec channel for answering the newbie questions that
made this possible. The sheer volume of problems that could have
been caught by a decent test suite is insane. I get it now.