Can't use derive macro for Component if specs::Component is used under another name

The derive macro for components seems to be assuming that the literal string "Component" in my source code is going to point to `specs::Component`.

https://github.com/amethyst/specs/blob/d4435bdf496cf322c74886ca09dd8795984919b4/specs-derive/src/lib.rs#L72

This isn't true if I have my own `Component` type and I have done something like `use specs::Component as SComponent;`. It's also not true if I'm also using another library using similar code that wants ownership of the non-namespaced name `Component`.

The macro should be changed to use a fully-qualified `specs::Component`, so it can coexist with `Component`s from other crates.

Or am I doing something very wrong?