Install virtualenv on all images
Install virtualenv on all images

Also add 2.7.9 and 3.4.3

vinaykaradia/travis-cookbook-cloned,Zarthus/travis-cookbooks,Acidburn0zzz/travis-cookbooks,gavioto/travis-cookbooks,Acidburn0zzz/travis-cookbooks,spurti-chopra/travis-cookbooks,Zarthus/travis-cookbooks,Zarthus/travis-cookbooks,Zarthus/travis-cookbooks,spurti-chopra/travis-cookbooks,ardock/travis-cookbooks,travis-ci/travis-cookbooks,Distelli/travis-cookbooks,ljharb/travis-cookbooks,ardock/travis-cookbooks,dracos/travis-cookbooks,ljharb/travis-cookbooks,ardock/travis-cookbooks,spurti-chopra/travis-cookbooks,Distelli/travis-cookbooks,Distelli/travis-cookbooks,vinaykaradia/travis-cookbook-cloned,Acidburn0zzz/travis-cookbooks,gavioto/travis-cookbooks,travis-ci/travis-cookbooks,dracos/travis-cookbooks,ljharb/travis-cookbooks,ardock/travis-cookbooks,dracos/travis-cookbooks,dracos/travis-cookbooks,Distelli/travis-cookbooks,gavioto/travis-cookbooks,gavioto/travis-cookbooks,travis-ci/travis-cookbooks,vinaykaradia/travis-cookbook-cloned,vinaykaradia/travis-cookbook-cloned,Acidburn0zzz/travis-cookbooks,vinaykaradia/travis-cookbook-cloned