Simplier installation (into app/Lib/View) and added added English REAME

Hi Oli,

these are changes I made:
* added general installation instructions as submodules for CakePHP (with needed changes to main index.php), PHPTAL and CakePHP2PHPTAL,
* simplified installation procedure by putting **PhptalView.php** into *app/Lib/View*,
* readded include of PHPTAL in CakePHP2PHPTAL,
* added english README.

Following CakePHP conventions I installed PHPTAL into *app/Vendor* (as external library) and CakePHP2PHPTAL into *app/Lib/View* (because it extends Cake's View).

I'm curious what's your opinion for these changes?

Best,
Konrad