New rights management method: regex
user and collection are matched against regular expression to determine read/write access
Merge pull request #43 from Sweil/regex-rights-management

New rights management method: regex
Change a couple of things in regex-based rights manager
Assume that the collection is an addressbook when "carddav" is in URL
Add pypy in tox
Update README
Use a more simple rights manager
Don't check the file twice for rights
Fix setup.py
Fix rights type "None"