Rename storage.save() to storage.dump().

The name matches the load/dump in the json library.
Import olny storage from mopidy.internal (not all of mopidy.internal).

mopidy/core/actor.py

@@ -184,7 +184,7 @@ class Core(
             history=self.history._export_state(),
             playback=self.playback._export_state(),
             mixer=self.mixer._export_state())
-        storage.save(file_name, data)
+        storage.dump(file_name, data)
         logger.debug('Save state done.')
 
     def _load_state(self, coverage):

mopidy/internal/storage.py

@@ -35,7 +35,7 @@ def load(path):
         return {}
 
 
-def save(path, data):
+def dump(path, data):
     """
     Serialize data to file.
 

mopidy/local/json.py

@@ -9,7 +9,7 @@ import sys
 import mopidy
 
 from mopidy import compat, local, models
-from mopidy import internal
+from mopidy.internal import storage as internal_storage
 from mopidy.internal import timer
 from mopidy.local import search, storage, translator
 
@@ -99,7 +99,7 @@ class JsonLibrary(local.Library):
                     self._json_file)
                 self._tracks = {}
             else:
-                library = internal.storage.load(self._json_file)
+                library = internal_storage.load(self._json_file)
                 self._tracks = dict((t.uri, t) for t in
                                     library.get('tracks', []))
         with timer.time_logger('Building browse cache'):
@@ -167,7 +167,7 @@ class JsonLibrary(local.Library):
         self._tracks.pop(uri, None)
 
     def close(self):
-        internal.storage.save(self._json_file,
+        internal_storage.dump(self._json_file,
                               {'version': mopidy.__version__,
                                'tracks': self._tracks.values()})
 

tests/core/test_actor.py

@@ -81,7 +81,7 @@ class CoreActorExportRestoreTest(unittest.TestCase):
         file_path = os.path.join(self.temp_dir, 'core', 'state.json.gz')
 
         data = {}
-        storage.save(file_path, data)
+        storage.dump(file_path, data)
         self.assertTrue(os.path.isfile(file_path), 'missing persistent file')
 
         self.core.setup().get()