added documentation for using palmasec/DoctrineORMServiceProvider and dflydev/dflydev-doctrine-orm-service-provider in order to register the custom functions in Silex
added documentation for using palmasec/DoctrineORMServiceProvider and dflydev/dflydev-doctrine-orm-service-provider in order to register the custom functions in Silex

fabiopaiva/doctrine-extensions,orocrm/doctrine-extensions,basz/doctrine-extensions