Make Python 2.6 an allowed failure on Travis CI
Make Python 2.6 an allowed failure on Travis CI

Until httreplay supports Python 2.6, or I find another library that
does, pull request testing won't work with Python 2.6.

nickmalleson/tweepy,nickmalleson/tweepy,bconnelly/tweepy,conversocial/tweepy,aleczadikian/tweepy,abhishekgahlot/tweepy,vivek8943/tweepy,vishnugonela/tweepy,arunxarun/tweepy,truekonrads/tweepy,tuxos/tweepy,srimanthd/tweepy,tweepy/tweepy,raymondethan/tweepy,nickmalleson/tweepy,kskk02/tweepy,zhenv5/tweepy,obskyr/tweepy,hackebrot/tweepy,techieshark/tweepy,vikasgorur/tweepy,svven/tweepy,iamjakob/tweepy,abhishekgahlot/tweepy,damchilly/tweepy,robbiewoods05/tweepy,LikeABird/tweepy,Choko256/tweepy,aganzha/tweepy,awangga/tweepy,elijah513/tweepy,yared-bezum/tweepy,kylemanna/tweepy,sa8/tweepy,rudraksh125/tweepy,IsaacHaze/tweepy,takeshineshiro/tweepy,thelostscientist/tweepy,tsablic/tweepy,kcompher/tweepy,edsu/tweepy,nickmalleson/tweepy,markunsworth/tweepy,cogniteev/tweepy,wjt/tweepy,markunsworth/tweepy,sidewire/tweepy,atomicjets/tweepy