Remove unused tags and bugzillaFeed bingle config

Setting tags doesn't work in mingle, and only bugello uses bugzillaFeed.
The call for the unused getBugzillaFeedUrl() had the side-effect of
setting the required newPickleTime member variable, so promote this into
a setPickleTimeNow() method.

Also remove one stray ending whitespace.
Add needed sections to sample bingle.ini

bingle.py complains if the config file lacks these. I'm not sure what
[mapping] or the two sets of properties do.

Issue #8
Merge pull request #13 from skierpage/master

Remove unused tags and bugzillaFeed bingle config