Enable automatic proxy detection for remote ls_remotes()

See #642

Author: sathieu

pygit2/remote.py

@@ -159,13 +159,19 @@ def fetch(self, refspecs=None, message=None, callbacks=None, prune=C.GIT_FETCH_P
 
         return TransferProgress(C.git_remote_stats(self._remote))
 
-    def ls_remotes(self, callbacks=None):
+    def ls_remotes(self, callbacks=None, proxy=None):
         """
         Return a list of dicts that maps to `git_remote_head` from a
         `ls_remotes` call.
+
+        Parameters:
+
+        callbacks : Passed to connect()
+
+        proxy : Passed to connect()
         """
 
-        self.connect(callbacks=callbacks)
+        self.connect(callbacks=callbacks, proxy=proxy)
 
         refs = ffi.new('git_remote_head ***')
         refs_len = ffi.new('size_t *')