• Added: System to return complex properties from PROPFIND.
• Added: support for {DAV:}supportedlock.
• Added: support for {DAV:}lockdiscovery.
• Added: 6 new tests.
• Added: New plugin system.
• Added: Simple HTML directory plugin, for browser access.
• Added: Server class now sends back standard pre-condition error xml bodies.
  This was new since RFC4918.
• Added: Sabre_DAV_Tree_Aggregrate, which can 'host' multiple Tree objects into
  one.
• Added: simple basis for HTTP REPORT method. This method is not used yet, but
  can be used by plugins to add reports.
• Changed: ->getSize is only called for files, no longer for collections. r303
• Changed: Sabre_DAV_FilterTree is now Sabre_DAV_Tree_Filter
• Changed: Sabre_DAV_TemporaryFileFilter is now called
  Sabre_DAV_Tree_TemporaryFileFilter.
• Changed: removed functions (get(/set)HTTPRequest(/Response)) from Server
  class, and using a public property instead.
• Fixed: bug related to parsing proppatch and propfind requests. Didn't show up
  in most clients, but it needed fixing regardless. (r255)
• Fixed: auth-int is now properly supported within HTTP Digest.
• Fixed: Using application/xml for a mimetype vs. text/xml as per RFC4918 sec
  8.2.
• Fixed: TemporaryFileFilter now lets through GET's if they actually exist on
  the backend. (r274)
• FIxed: Some methods didn't get passed through in the FilterTree (r283).
• Fixed: LockManager is now slightly more complex, Tree classes slightly less.
  (r287)