Add flag to disable wheels for python 2.6
Add flag to disable wheels for python 2.6

Setuptools 0.8 is required for pip wheel support, Python 2.6 and older only
support setuptools 0.7, we therefor need to disable wheels.

vmfarms/puppet-python,ody/puppet-python,xaque208/puppet-python,skpy/puppet-python,vmfarms/puppet-python,xaque208/puppet-python,vicinus/puppet-python,vicinus/puppet-python,ghoneycutt/puppet-python,skpy/puppet-python,ody/puppet-python,ghoneycutt/puppet-python,stankevich/puppet-python,xaque208/puppet-python,stankevich/puppet-python