cargomedia/CM — pull request #1222 by njam (2014-05-16 15:11:25+00:00)
Title: Small ServiceManager adjustments

- Throw if you try registering an already registered service.
- Don't throw `CM_Exception_Nonexistent` - this exception will translate to a 404-page in many cases!

@cm-jan @tomaszdurka please review