Add Minitest dependency

Use minitest hoe plugin, add minitest as dependency in Gemfile
Minitest-ify tests

Switch over from test unit style to minitest in tests
Let's see if changing to be order dependent fixes the tests
Drop Rubinius from Travis CI tests

Because it seems like way too much work.

'I don't care about Rubinius. Evan knows how I feel' - Ben
Simplifying Gemfile minitest dependency

Since the test Gemfile group only contains the single minitest gem, we
can switch over to passing a group parameter to the minitest gem
dependency instead of explicitly creating a group.
Adding myself to contributers

My only goal in life has been to become a contributer to BenString, and
with this commit my dreams will have finally come true.
Still bad at typing

Guess I love the enter key too much
Merge pull request #8 from davy/travis-test

Yay testing!