[MERGE] Allow appending path segments to the :<name> style aliases.

[Aaron Bentley]

Aaron Bentley has voted tweak.
Status is now: Conditionally approved
Comment:
Sorry for letting the perfect be the enemy of the good.  I'll apply 
John's split tweak and merge.  Future improvements would be nice, but 
this won't prevent them.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C48A3A396.7080805%40canonical.com%3E
Project: Bazaar