Sean Kinsey c38d56d9db Expose the bridge instance to CxxModule via a weak_ptr
Summary:
In order for `CxxModule` modules to be able to do things like emit events, we need to expose the bridge instance.

To allow classes derived from `CxxModule` in other projects to include `<cxxreact/Instance.h> I also needed to convert all the header includes to non-relative  ones.

Reviewed By: javache

Differential Revision: D4564145

fbshipit-source-id: a5bc28dd9b40e2b141af9e867105c56083fbdcdc
2017-02-15 10:04:17 -08:00
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