Merge pull request #43 from cseed/master

Agreed to license change.
Switch license to LGPL v3 of ruby code

This only covers the ruby implementation (the protocol has its own
license).  See the deleted file, license-change.md, for signoffs from
contributers.
Remove ruby implementation

The ruby implementation is being moved to its own repository
Remove proof-of-concept documentation
Merge remote-tracking branch 'upstream/master'