Don't count comments for MethodLength cop

I don't want people to feel penalized for adding comments to the bodies
of their methods, since they can be very valuable without adding to the
complexity of the code.

Change-Id: I9ad8ad8bd13a048ae5810982536f1cbdeea7bf75
Disable Void cop for spec directory

This cop complains about some basic RSpec functionality, so I am
disabling it for this directory to cut down on the noise.

Change-Id: I68b879f3aa70e822b39f13f9083847ebda9d6e42