improve cli's tests description and remove 'should'
improve core_ext's tests description and remove 'should'
improve formatter's tests description and remove 'should'
improve rb_support's tests description and remove 'should'
improve runtime's tests description and remove 'should'
improve wire_support's tests description and remove 'should'
improve world's tests description and remove 'should'
improve cucumber's tests description and remove 'should'
Revert "improve cli's tests description and remove 'should'"

This reverts commit d2a72f69e92acf5d94ba3a775cbb4fc71ffd6266.
improve cli's tests description and remove 'should'
Merge pull request #680 from johnvoloski/master

Improve test's descriptions and remove 'should'