Skip all http server tests on travis-ci
Skip all http server tests on travis-ci

* These are failing sporadically, probably for threading-related reasons ...

krischer/python-future,krischer/python-future,PythonCharmers/python-future,QuLogic/python-future,michaelpacer/python-future,QuLogic/python-future,PythonCharmers/python-future,michaelpacer/python-future