Fix no support in IDEA 14

I'm not sure if this is necessarily IDEA 14-related or not, but this fixes my issue with #9. Please merge with caution!

As you can see, I simply removed a few things. From the compiler manager I removed the compiler configuration and such so that the signature matched the signature of `CompilerManagerImpl`. The old (current master) `super()` call must have been removed or something, breaking the API.

Same thing goes for instantiating the `CompileContextImpl` in `RustCompilerDriver` -- looks like they simply removed a parameter.