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
Adding exception class ServiceUnavailable
fixing copyright
use correct exception base class
Adding exception class Sabre_DAV_Exception_ServiceUnavailable
Adding exception class Sabre_DAV_Exception_ServiceUnavailable
fixing class name in doc
Merge pull request #305 from DeepDiver1975/master

Adding exception class ServiceUnavailable
Merge pull request #308 from DeepDiver1975/1.8

Adding exception class Sabre_DAV_Exception_ServiceUnavailable
Merge pull request #307 from DeepDiver1975/1.7

Adding exception class Sabre_DAV_Exception_ServiceUnavailable to 1.7