Spas: Simple PHP Application Servers

I think I'm working on something somewhat unique in the PHP world.

https://github.com/cameronjacobson/Spas

Before I get too far I'd love to get some feedback from some expert PHP devs. Familiarity with Symfony2, Silex, and the Event package are ideal.

All examples/* seem to be working appropriately (with basic testing so far), and I'm definitely aware of and trying to be cautious in terms of the potential for leaky global application variables.