- gzip api response

- dont parse xml on client
- load xml in thread

oxcd/api.py

@@ -10,6 +10,7 @@ def init(backend, site, data):
 actions.register(init, cache=False)
 
 def library(backend, site, data):
-    response = backend.library
+    response = {}
+    response['tracks'] = backend.tracks
     return json_response(response)
 actions.register(library, cache=True)