Summary: The packager was adding compression middleware too late in the stack. This makes things a little faster especially if you're loading through dynamic DNS for example.
Closes https://github.com/facebook/react-native/pull/4121
Reviewed By: svcscm
Differential Revision: D2664373
Pulled By: frantic
fb-gh-sync-id: 46cce81ff6d9e4e71e1718d7e96b58449c248bc1