Fix for #810 rebased against 1.2.1

[ghost]

See #810

[phalcon]

thank you

@sjinks do you know a way to catch a PHP exception inside the extension?

[ghost]

if (EG(exception)) {
    /* Userland thrown an exception */
    assert(Z_TYPE_P(EG(exception)) == IS_OBJECT);
    assert(instanceof_function(Z_OBJCE_P(EG(exception)), zend_exception_get_default(TSRMLS_C) TSRMLS_CC));

    /* If you have handled the exception (ie, emulated `catch()` block), then */
    zend_clear_exception(TSRMLS_C);
}

[phalcon]

Thank you, going to add a better error handler in Mvc\Dispatcher and Mvc\Micro