I don't know what's going on with PyPi and transitfeed, but this is to get around the issue I opened regarding the fact that the latest version of transitfeed in PyPi according to the PyPi page for the project is 1.2.11.  Install without specifying a version, and you get 1.2.12 just fine.  Try to install by requiring either 1.2.11 or 1.2.12 or >1.2.11 and it fails.