add pyflakes target & associated fixes. Also decided to save JSON to --tree file so it can

be better used programatically.  May have to come up with another system of tree logging for
playbook if playbook decides to have tree logging.  Presumably not the highest priority.

bin/ansible

@@ -119,7 +119,7 @@ class Cli(object):
                 options.one_line
             )
             if options.tree:
-                write_tree_file(hostname, msg)
+                write_tree_file(options.tree, hostname, bigjson(results))
             buf += msg
             
         if has_dark_hosts(results):