[sfPropel15Plugin] Updated Propel license to MIT
[sfPropel15Plugin] Updated Propel license to MIT

git-svn-id: 5328d55da731c7b3abbe4e40105e1c39a9c375f3@29098 ee427ae8-e902-0410-961c-c3ed070cd9f9

Symfony-Plugins/sfPropel15Plugin