Detect if the loaded file is a CWL tool and its specification

[ivanbatic]

No description provided.

[mayacoda]

We can use the current server's storeService.readCWLFiles which will attempt to differentiate between a regular json/yaml file and one that has class: CommandLineTool or class: Workflow in the root. It returns the type of CWL tool that is described in the file.

Since v1.0, cwlVersion is a required property at the tool's root, so we can differentiate between v1.0 and draft-2 in that way. We should "sniff" out the version we should be validating against before we start validation.