Slice 91 - multiple injectors per application

Implemented https://cognifide.atlassian.net/browse/SLICE-91
I'd reset all changes in this file and move your efforts to `InjectorNameUtil`. You should modify `getFromResourceType()` method there, so it takes `InjectorsRepository` as a second parameter and finds out the injector name using `InjectorRepository#getInjectorNameByPath()` method (see comment below).

Once you do this, this class should automagically work without extra changes.