phases: add a phase method to context

mercurial/context.py

@@ -117,6 +117,8 b' class changectx(object):'
         return self._repo.nodetags(self._node)
     def bookmarks(self):
         return self._repo.nodebookmarks(self._node)
+    def phase(self):
+        return self._repo._phaserev[self._rev]
     def hidden(self):
         return self._rev in self._repo.changelog.hiddenrevs