Started work on WebDAV-Sync plugin.
Added hasSyncInfo
Removed extra spaces
Next version of the sync plugin. Most things are now implemented, with
the exception of support for the If: header.
Merge branch 'master' into webdav-sync
docblock
Moved the getIfConditions method from the Locks plugin to the Server
class.
Some comments
Merge branch 'master' into webdav-sync
Merge branch 'master' into webdav-sync
Merge branch 'master' into webdav-sync

Conflicts:
	lib/Sabre/DAV/Locks/Plugin.php
	tests/Sabre/DAV/GetIfConditionsTest.php
Namespaces
Merge branch 'master' into webdav-sync
Bumped copyright year
Merge branch 'master' into webdav-sync
getIfConditions fixes.

More clarity and documentation.
Lock plugin almost working with the new system.
Support for lock refreshes.
The double-lock testcase.
Dealing with existing exclusive locks. Passes the litmus test!