Two small fixes in the sfPropelPlugin for newer PHP versions

I'v patched the sfPropelPlugin for newer versions of PHP that have deprecated mysql_escape_string
Besides of an out of memory issue and a preg_match error (most likely a model issue), I get no strict warnings running `./symfony propel:build-model` on 5.5. For me, that method is never executed but the platform does get initialized. 

Which command do you run to trigger this?