lazily default partialsLoader to loader
lazily default partialsLoader to loader

Conflicts:
	src/Mustache/Engine.php

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