created stub classes for new hg methods

--HG--
branch : pmacs2

method/hg.py

@@ -1,5 +1,17 @@
 from method import Method, Argument
 
+class HgCommit(Method):
+    """Commit the current file """
+    w.set_error("unimplemented")
+
+class HgBlame(Method):
+    """Show buffer annotated with hg metadata"""
+    w.set_error("unimplemented")
+
+class HgLog(Method):
+    """Show hg log for this buffer"""
+    w.set_error("unimplemented")
+
 class HgDiff(Method):
     """Diff the current file with the version in Mercurial"""
     def _execute(self, w, **vargs):