Enhancement: Remove problematic shrink-ray module from default package

[MariusStuparu]

As some others have said in other issues, shrink-ray module has a nasty dependency in the iltorb module. iltorb needs binary compilation with node-pre-gyp and node-gyp, and this has failed for me on all OSs that I've tried: on OSX 10.12 and 10.13 it fails 50% of the time, on Windows 8 and 10 it requires a lot of other instalations, and still fails 50% of the time, and on CentOS 6 (my production server) it just does not install, so 100% fail. It only worked on the Ubuntu machine that Heroku deploys. I had to remove it from package.json and from Express to make the app run.

I know it's an external module, and may be useful, but, in production, you would already have some other layers above the app that can compress the data, like an Apache and/or NGINX proxy, that already have functional compression modules.