Add color support

You can change the default color by changing the props (.props file for
the filesystem storage backend).
Fix owner_* rights with python2 (fix #49)
Match stupid naming conventions used by Apple's clients for collections
Use a simpler code to detect not-created-yet addressbooks
Update news for 0.8.1
Fix the test used to guess if a path is a collection
Don't be so optimistic about collection detection.

For clients that can't create collections with MK* requests and that don't
use GET requests, is_leaf gives False for empty collections only reached
through a PROPFIND request. As Radicale can't create a collection for
each type of request, we have to strip the last part of path for paths ending
with .ics and .vcf, as they can be represent items and not collections.
Add documentation and example for rights management
Fix stupid bug in logs
Decode urls in XML (fix #26)
Merge pull request #48 from jspricke/color

Add color support
Get a random color for calendars with no color
Update news
Fix built-in owner_only right
Merge pull request #54 from osalmi/master

Fix built-in owner_only right
Merge branch 'master' of github.com:Kozea/Radicale
Adds multifilesystem storage backend (See #30)
Adds git support to Radicale (Fix #30)
Don't create the repository for each change
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