changed method_exists to is_callable in sfPropelData (closes #355 - patch from pookey)
changed method_exists to is_callable in sfPropelData (closes #355 - patch from pookey)

git-svn-id: 2f0e1b834f829f9d45d4005679b0d62d953a4cdf@1076 4396de85-42e0-4213-a939-0f47b466bcdf

morhekil/symfony,morhekil/symfony,morhekil/symfony