* upgraded zend-expressive from version 1 to 2
* Changed error handler for compatibility with Zend Expressive 2
* generated newest sample files for Petstore ze-ph
* removed ErrorMiddleware because it is never been used anymore. Regenerated samples
* removed ErrorMiddleware Template from Codegen
* remove ErrorMiddleware from petstore sample
* Fixed some code styles
* regenerated ze-ph samples with corrected code styles
* added new line at the end of the file