Add a test to discourage people from implementing support for __call.
Add a test to discourage people from implementing support for __call.

Pull in the test from https://gist.github.com/655784

This should discourage reports like #16, #19 and #55, and #76.

ericariyanto/mustache.php,evdevgit/mustache.php,sophatvathana/mustache.php,cgvarela/mustache.php,BrunoDeBarros/mustache.php,bobthecow/mustache.php,thecocce/mustache.php,zuluf/mustache.php,irontec/mustache