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
Adding CONTRIBUTING.mdown

Inspired by Ceeram's PR in

	https://github.com/cakephp/cakephp/pull/1173/
updating copyright year and adding authors file
docblocks: missing @license, @author, alignment
Fix indentation, remove trailing/extra space
Fix: Login attempt counter cache was not generated

This allow unlimited login attempts which we should prevent.
The functionality is now reimplemented using events which is much
cleaner.
Fix: pass theme value to CakeEmail
Skip test when run against incorrect cake version