sanitize data from manifest files
Merge branch '1.3'

Conflicts:
	Plugin/Extensions/View/ExtensionsThemes/admin_index.ctp
	plugins/extensions/controllers/extensions_plugins_controller.php
	plugins/extensions/controllers/extensions_themes_controller.php
	plugins/extensions/views/extensions_plugins/admin_index.ctp
test against cakephp 2.1.5