Fix for broken PDF images in /shared

(cherry picked from commit 9905db8655d226b73694f771d9b6e879b30961c6)
Added Workbench N&N. Moved Data Modeller images to same hierachy as pages
(cherry picked from commit 0d3bc649b92ff24e5dd38411e683ca0714cd84e2)
docs: Command line configuration tool for Workbench

(cherry picked from commit ceeb23704dc9d32055b13a048f1f827c5533fcc5)
shared: drools-wb-rest documentation
jbpm-docs: exception management documentation (80% done)

TODO:
- fill/finish Business Exception examples section
- Add pictures (with "callouts"/numbers.. argh) for BPMN2 examples
jbpm-docs: jBPM remote API documentation: REST, JMS and (remote) Java API docs
jbpm-docs: added concurrency and async execution sections