updated symfony plugin to add entity generation and schema update aliases (#5042)

plugins/symfony2/symfony2.plugin.zsh

@@ -25,5 +25,7 @@ alias sfcw='sf cache:warmup'
 alias sfroute='sf debug:router'
 alias sfcontainer='sf debug:container'
 alias sfgb='sf generate:bundle'
+alias sfge='sf doctrine:generate:entity'
+alias sfsu='sf doctrine:schema:update'
 alias sfdev='sf --env=dev'
 alias sfprod='sf --env=prod'