Updating for Python 2.7.6

Replace brews/python.rb with current stock homebrew formula
Replace $BOXNE_HOME/homebrew assumptions with $HOMEBREW_ROOT
Bump to 2.7.6-boxen3
Remove file resources (managed in brew formula)
Removed pip empty parameter validation (Puppet already requires setting)
Update virtualenvwrapper to 4.2
Removing env script (deprecated)
Style fixes
Updating tests
Updating spec fixtures to latest releases
Updating specs
Petty whitespace fixes