Added platforms support
remove invalid alias
Rubinius is clearly not working on travis, add to ingnore group for now
Make changes requested by @sikachu
Prefix `bundle exec` on `run_simple`

The test were passing fine locally since I had `rubygems-bundler` gem,
which setups the environment without needing to run `bundle exec`.
However, this does not work on TravisCI.
Turn off verbose for RSpec rake task
Update build matrix

* Install stable version of Bundler
* Add Ruby 2.1.0
* Change `rbx-19mode` to just `rbx`
* Allow failure on `rbx` :(
Fix build error on Rubinius by requiring matcher

There was some problem with class autoloading in Rubinius, which can be
workaround by just requiring that missing file.

See https://github.com/rubinius/rubinius/issues/2934
Switch Ruby 2.1.0 with 2.1.1
Bump to 1.0.0.beta3
Fix build on JRuby

* Stop using Aruba CLI in the RSpec.
* Shift from `bundle exec` to generate and use binstubs.
Remove redundant cucumber feature
Split CLI specs into multiple files