Adds multifilesystem storage backend (See #30)
Adds git support to Radicale (Fix #30)
Don't create the repository for each change
Update news
Big changes: next version is 0.9
Added functionnal tests
Adds base tests for storage configs
Fixed tests and added tests for authentication
Remove useless config keys
Merge pull request #61 from cristen/tests

Tests
Use table attribute instead of string in database order by (probably fixes #59)
Remove useless primary key from line table