add yaml/yml support for config files

if a file has an extension of .yml, check for yaml parser
if parser, parse
if no parser, throw exception
provide support for both http://php.net/manual/en/book.yaml.php and http://symfony.com/doc/current/components/yaml/introduction.html

Triaged for Tipsy 2.0 (#57)

App::config() loads .yaml / .yml via ext-yaml or symfony/yaml. Closing as fixed in 2.0.

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