The gem is called 'bundler'

So, funny thing is that there IS a rubygem called 'bundle' that was written
by a guy who was sick of people requiring the 'bundle' gem instead of 'bundler'
- and ALL IT DOES is setup a dependency for 'bundler'. That's most likely why
this worked for so long.  But fuck that guy, let's actually fix our shit.
Update spec tests for 'bundler'

The previous change corrected the name of the gem from 'bundle' to
'bundler', but omitted a correction for the spec tests. This commit
updates the spec tests to look for 'bundler' instead of 'bundle'.
Merge pull request #27 from glarizza/bundler_fix

The gem is called 'bundler'