Restrict rubocop version to 0.23

Need to figure out whet is needed for 0.24
Update RuboCop and remove ruby 1.9.2 support
Allow failtures for rbx-2 on travis

Something is wrong on travis regarding rbx-2 - so allow failtures for
now.
Merge pull request #15 from nevir/update

Update RuboCop and remove ruby 1.9.2 support
Add autocorrect to RSpec::ExampleWording cop.

This experimental - use with care and check the changes.
Merge pull request #14 from nevir/example_wording_autocorrect

Add autocorrect to RSpec::ExampleWording cop.