Updated travis configuration to include 5.5 testing.
Updated travis configuration to include 5.5 testing.

tedious/Stash,bankiru/Stash,AndrewCarterUK/Stash,localheinz/Stash,tedious/Stash,localheinz/Stash,AndrewCarterUK/Stash,jaredtking/Stash,bankiru/Stash,graphis/Stash,andrerom/Stash,csburton/Stash,alawnchen/Stash,csburton/Stash,theUniC/Stash,graphis/Stash,jaredtking/Stash,theUniC/Stash,andrerom/Stash,alawnchen/Stash