Use old-style set constructor, for compatibility with python 2.6
Merge remote-tracking branch 'rboulton/fix_26'
My shell scripting is not so good
correct case is important
continue poking at .travis.yml
and again
remove 2.6 from the build until I decide if I care
support packaging for python3 using 2to3
go back to new style set constructor for consistency
better way of supporting python 3
the 5 second timeout appears to be too short for travis's build machines