Scjson support
Created by: feyzo
PR ready. Merge with https://github.com/jbeard4/scxml-test-framework/pull/14
Currently 160 tests are passing, 55 from W3C. Closing 12 issues: 8 errors, 4 fails.
Closes #189 (closed) Closes #221 (closed) Closes #222 (closed) Closes #223 (closed) Closes #224 (closed) Closes #225 (closed) Closes #226 (closed) Closes #227 (closed) Closes #228 (closed) Closes #230 (closed) Closes #272 (closed) Closes #284 (closed)