[pony-build] mechanize

[C. Titus Brown]

On Mon, Mar 15, 2010 at 07:18:57PM -0400, Max Laite wrote:
> As far as I can tell, since the refactoring, the cache_dir is no longer
> checked for existence.
> 
> Somewhere around line 447 should be a call to create_cache_dir no?

Yep!  How embarrassing -- the client tests should have caught that, but
apparently they don't test for it.

Max, could you fix this & write a test for it?

Khushboo, in the meantime, just do

	os.mkdir(os.path.expanduser('~/.pony-build'))

thanks,
--titus