[#53734191] Clean up already existing Ruby2.0 Support

Mostly minor changes involving require statements
[#53734191] Move to NREL based URL's and warn if SWIG < 2.0.10
Correct comment regarding ruby include paths
[#53260919] Detect and pass RUBY_LIBRARY to sub projects
Merge pull request #384 from NREL/53260919-AddRuby2.0Support

53260919 add ruby2.0 support