This injector is roughly based on MiniGuice:
http://code.google.com/p/google-guice/source/browse/extensions/mini/src/com/google/inject/mini/MiniGuice.java

Unlike Guice, this injector uses only static configuration.
This will enable more up front checking as well as backends
that use code generation instead of reflection.

Current limitations:
 - no support for circular dependencies.
 - no method injection.