Revert "Revert "Merge pull request #161 from casschin/get-response-code-timeout""

This reverts commit eaa61ac9511d5518587c8ba0e1baa149dca06333.
Merge branch 'master' of github.com:mozilla/mcom-tests into upmaster
XFailing test_b2g.py
Merge branch 'master' of github.com:mozilla/mcom-tests into upmaster