Merge commit '5b37cf23199b7419956cfd8f482a8de76066d876' into draft-4

Author: Peter Amstutz

cwltool/schemas/draft-2/CommonWorkflowLanguage.yml

@@ -978,6 +978,8 @@ $graph:
   specialize:
     - specializeFrom: "#InputSchema"
       specializeTo: "#SchemaDef"
+    - specializeFrom: "#Binding"
+      specializeTo: "#CommandLineBinding"
   fields:
     - name: name
       type: string