Fix the import of a component from a component with the same base name

[tanguylebarzic]

Fix #337, without accessing internal webpack variables.

[calesce]

Cool, I played around with this, and it works in a few simple cases. I'd prefer to have this kind of stuff tested, but we don't have tests on the Webpack loader anyways (something to improve!).

Either way, since #337 was directly affecting at least a few people, and I don't see how it can break other use cases, I'll go ahead and merge it. Thanks!