Test on Python 3
Make STATSD_MODEL_SIGNALS False by default (to match the documentation.) People should explicitly turn this on.
Merge pull request #72 from vikingco/fix/STATSD_MODEL_SIGNALS_false-by-default

Make STATSD_MODEL_SIGNALS False by default (to match the documentation.)...
Merge pull request #71 from frewsxcv/master

Fix error in Python 3
Merge pull request #70 from frewsxcv/patch-1

Test on Python 3
Only install unittest2 library on Python 2.6