Allow a Reference to be sent in a STIX upload
Revert "Allow a Reference to be sent in a STIX upload"

This reverts commit 5135ca3b13083d2c483b307839e2ab3d804e00a3.
Allow Reference to be given in STIX upload form
Fix error in field type.

Should be a Char field, not a choice fie.d
Merge pull request #192 from sabade/Reference-in-Stix-upload

Reference in stix upload