add ruby 2.1.5 and rails 4.0 and 4.1 gemfiles
use minitest/unit instead of test/unit
add a comment about hardcoding minitest version in gemfile for 3.2.x
explicitly add version minitest 5.4.3 to gemspec
remove minitest from gemspec file
Merge pull request #10 from code-mancers/travis-support-ruby-2.1.0-rails-4.x

Travis support ruby 2.1.0 rails 4.x