JSON export of workflow structure and annotations

(also almost valid JSON-LD)
Tidy
Nested workflow support (and nested-nested).

Tested with ENM workflow which is hyper-nested :)

.. triggered a bug in SCUFL2 - version bumped
Moved annotationsFor() to scufl2Tools
Ignore the ENM workflow as it takes 24 seconds to test
Example JSON export
JSON test
MarkDown..
README markdown fun
Experimental JSON-LD context
Include FOAF namespace
Converted ENM workflow
Add snapshot repository for SCUFL2 0.12.0-SNAPSHOT
A standalone scufl2tool JAR
Add datalinks and control links
Updated examples
Download link
Markdown has a funny syntax..
Really update example!
README - added the command line for stdout