Add library support

[Keboo]

Right now AutoDI, looks for an entry point in the assembly and wires up its setup call inside of that. However, this can be problematic if you are producing a library that you expect to be consumed by other. Ideally AutoDI should work without the consumer of the library needing to know about AutoDI.

I am thinking something like the following:

• New setting for turning this behavior on and off. Defaults to off.
• When enabled, do the registration in the module initializer rather than looking for an entry point. Turning this on should disable the entry point registration.