Merge pull request #87 from jc00ke/master

Only use 1 Bundler job on Rubinius
Test latest MRI too
Remove unneeded line from travis config
require sucker_punch before  monkey patch
Merge pull request #88 from seuros/patch-1

require sucker_punch before  monkey patch
Bump version
Update railtie.rb

Remove empty line
Merge pull request #89 from arcz/patch-1

Update railtie.rb
Remove Travis hack for rbx-2

With travis-ci/travis-ci#2952 we no longer need this hack.