Get 'make dist' working; fix Ruby/bundler

[apjanke]

Right now I'm having trouble getting Ruby and bundler working on my Mac, so I can't build the local docs.

[docs] $ pwd
/Users/janke/local/repos/ExportMlx/docs
[docs] $ bundle install
Could not load OpenSSL.
You must recompile Ruby with OpenSSL support or change the sources in your Gemfile from 'https' to 'http'. Instructions for compiling with OpenSSL
using RVM are available at rvm.io/packages/openssl.
[docs] $

[apjanke]

Hacked around this by setting up my Ruby environment from the shell; now at least make doc is working.

Would still like to get this mlxshake_make doc working from inside a Matlab launched from /Applications in the Finder.