Add tox config for generating test coverage report

Change-Id: I5bd8a30d83eedf3384cd55b505ed9608fb5aa4c3
Merge branch 'tox-coverage' into doughellmann.com
improve test coverage for tinkerer.ext.rss

Change-Id: I2de39f5f2a8b4a8860729284805e926653c4ea40
Merge branch 'clean-rss' into doughellmann.com

Conflicts:
	tinkertest/test_rss.py

Change-Id: I213e64ec28e842b8f7a744724970f86dd72ce54a