Fixed helper_spec.rb
Bump .travis.yml ruby version to get bundle to install on CI.
Removed .should usage from helpers.rb. This is to avoid errors when users have disabled
the .should syntax in favour of expect() syntax. Avoided using the new syntax either, as
this might adversely effect users with older versions of RSpec. Chose to call the
expectation directly.
Merge pull request #135 from thomasfedb/fix-should-in-helper

Fix should in helper