added warning when build-time propel version and runtime-propel version do not match, refs propelorm/Propel#577
fixed version constants to make unit tests pass
Changed the signature of generated "getOMClass()" functions to a more generic form to be compatible with Concrete Inheritance Behaviour (as of: https://github.com/propelorm/Propel/issues/563#issuecomment-13036863).
Merge pull request #594 from youssefelbied/master

[Inheritance] Issue when mixing concrete and single inheritance in the schema
conditionally check for the propel runtime version. This is required when runtime.xml based tasks will be run.
Merge pull request #580 from staabm/run_vs_build_time_version

Run vs build time version
Merge remote branch 'upstream/master'