Fix issue 562: .hgignore requires newline at end.

Fix issue 562: .hgignore requires newline at end.

End-of-lines characters where discarded without any check for existence.

--- a/mercurial/dirstate.py	Sat May 19 22:46:59 2007 +0200
+++ b/mercurial/dirstate.py	Sat May 19 22:47:01 2007 +0200
@@ -65,6 +65,8 @@
         syntaxes = {'re': 'relre:', 'regexp': 'relre:', 'glob': 'relglob:'}
         def parselines(fp):
             for line in fp:
+                if not line.endswith('\n'):
+                    line += '\n'
                 escape = False
                 for i in xrange(len(line)):
                     if escape: escape = False