Added extensions to generate category & tag feeds.
Merge pull request #1 from muhuk/master

Added extensions to generate category & tag feeds.
Replaced iteritems() with items() for python3 compatibility.
Merge pull request #3 from muhuk/master

Replaced iteritems() with items() for python3 compatibility.
Slugify RSS filenames for categories.
Slugify RSS filenames for tags.
Merge pull request #5 from muhuk/master

Slugify RSS filenames.