ZF-2312: Automatic primitive type detection for Zend_Config
The following patch adds support for type detection in the Zend_Config class. (string)"1.2" is casted to (float)1.2, (string)"1" to (int)1, (string)"true" to (bool)true and (string)"false" to (bool)false. It is implemented as an opt-in option so it does not break the API. The code was done by Veit Bartels, one of my co-workers. He did that for our company which has allowed me to provide ZF patches. If it is required he would be able to sign a CLA.