Added the basic handlers for xml rpc requests.
Added the basic handlers for xml rpc requests.

Working:
* list_packages
* package_releases
* release_urls
* release_data

Not Working:
* search
* changelog
* ratings

popen2/djangopypi2,disqus/djangopypi,hsmade/djangopypi2,mattcaldwell/djangopypi,EightMedia/djangopypi,popen2/djangopypi2,hsmade/djangopypi2,pitrho/djangopypi2,pitrho/djangopypi2,disqus/djangopypi,benliles/djangopypi,EightMedia/djangopypi