Fix watchlists for windows, for files with backslash

watchlists.py

Index: watchlists.py
===================================================================
--- watchlists.py	(revision 18705)
+++ watchlists.py	(working copy)
@@ -104,6 +104,7 @@
     """
     watchers = set()  # A set, to avoid duplicates
     for path in paths:
+      path = path.replace(os.sep, '/')
       for name, rule in self._defns.iteritems():
         if name not in self._watchlists: continue
         rex_str = rule.get('filepath')