wxmac: don't use explicit sdk path argument on 10.9
wxmac: update 3.0.0 bottle.
Update litmus.rb

Litmus is primarily a debugging tool for webdav servers. Disabling the debug setting makes the tool a _lot_ less useful by default, as no debug logs are generated.

It doesn't make a lot of sense to have this setting on here, so I propose removing it again.
litmus: add 0.13 bottle.