[FEATURE] added autoloading for plugins

a plugin has now a namespace, e.g.:

Phile\Plugin\PhileParserMarkdown

this namespace is used to autoload classes.

example:
Namespace: Phile\Plugin\PhileParserMarkdown\Parser\Markdown
File: plugins/phileParserMarkdown/Classes/Parser/Markdown.php

Releases: 0.9.3
[REFACTOR] moved markdown parser class from core into plugin
[REFACTOR] moved meta parser class from core into plugin
[REFACTOR] use autoloader for plugins
[REFACTOR] move twig class from core to plugin
Merge pull request #85 from PhileCMS/feature/AutoloadForPlugin

[FEATURE] autoload for plugins