add attributes

adding attributes for exists and accessible.

Author: blacktwin

plexapi/media.py

@@ -85,6 +85,8 @@ class MediaPart(PlexObject):
             key (str): Key used to access this media part (ex: /library/parts/46618/1389985872/file.avi).
             size (int): Size of this file in bytes (ex: 733884416).
             streams (list<:class:`~plexapi.media.MediaPartStream`>): List of streams in this media part.
+            exists (bool): Determine if file exists
+            accessible (bool): Determine if file is accessible
     """
     TAG = 'Part'
 
@@ -104,6 +106,8 @@ def _loadData(self, data):
         self.syncState = data.attrib.get('syncState')
         self.videoProfile = data.attrib.get('videoProfile')
         self.streams = self._buildStreams(data)
+        self.exists = cast(bool, data.attrib.get('exists'))
+        self.accessible = cast(bool, data.attrib.get('accessible'))
 
     def _buildStreams(self, data):
         streams = []