Merge pull request #1 from halfbyte/master

Adding compatibility for ruby 1.9, also making the repo functioning with bundler
v2.1.4
Fixing permit_yo for ruby versions > 2.0.0

Ruby 2.0.0 changed the semantics of the respond_to? second argument:

Pre 2.0.0 it used to switch between showing private methods, now it
is used to switch between showing only public methods (default) and all methods (true)

As a quick hack I've updated all respond_to? calls to use this second argument. This feels wrong, though.