Date Tags Python

I got some bad feedback about svnlook’s usage in SubveRSSed. Some time ago Roel Vanhout proposed to replace some svnlook calls with pysvn API calls. I took the time to apply it and drop the remaining calls to svnlook :)

Hey windows users having issues with SubveRSSed and svnlook ? Give a try to SubveRSSed 1.2 !