[Success!] [MERGE] Make Tree.get_file_text and Tree.get_file_lines official

[Bundle Buggy]

This change has been merged.
Previous status: Conditionally approved

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C48F21CD5.5010506%40aaronbentley.com%3E
Project: Bazaar