Fix HTTPConnection strict-related DeprecationWarning in Py3. Resolves #342.
Tests and fail travis/tox on deprecation warnings.
s/assertEquals/assertEqual/
s/log.warning/log.warn/
Restrict warnings to deprecation warnings, because... Oh my.
Merge pull request #343 from shazow/fix-strict-py3

Fix HTTPConnection strict-related DeprecationWarning in Py3.