Add variable APP_NAME to rss feeds

The notice line in RSS feeds displayed the text Seriesly.com
which obviously isn't correct anymore!
Propably it would be more sophisticaed to not just display an user
defined app name but instead something like just "Seriesly".
Merge branch 'master' of git://github.com/stefanw/seriesly
Add gitignore
Merge remote-tracking branch 'moschlar/master'
Improve PEP8 compliance
Merge branch 'upgrade-2.7'

Thanks to @moschlar