added revision support for entity save and delete operations.
removed additional argument
fixed node tests, removed test controller.
fixed tests
Fixed test failures
remove revision from those tests.
more cleanup
working on save revision.
add hack for existing revision ids
change comments
fixed tests
killed ->revision, removed old_vid.
remove weird empty
change provided revision id.
fixed revision check in forum_node_update().
Fixed another revision check.
fixed weird bug
fixed revision check
change revision to a record array.
remove test entity form code.