Declare that we support Python 3

Note that this should not land until we figure out why `tox -e py33` doesn't
actually run any tests.

Change-Id: Id4e080cfbfca45b3bf7ed81b03a31414495a1348
Add "." for help strings

The command descriptions did not include a "." at the end but the
argument description does. Add "." everywhere.

Also capitalize and add "." for parameter of capabilities.

Change-Id: I2355e0d0c38170d669c8e568361faf4b68203d16
Fix running the unittests under py3

Since we added the tests.functional the py3 tests wasn't running
properly fixing it with some voodoo testr magic.

Change-Id: Id301adb32ba739f05591c4c352e0cf7d87576755
Merge "Add "." for help strings"
Provide a link to the documentation to the README

Change-Id: I99a46860ffff93452904d24504a4ccc58e8e64c6
Merge "Declare that we support Python 3"
Merge "Provide a link to the documentation to the README"