Release 1.2.1

• Spring dependencies updated (#459)
• Support for external static definitions added (#457)
• Iframe app (#467)
• LTS v1 Conformance Criteria - Updated (#473)
• Adding metadata to apiml-auth so that desktop can know expiration. Also use logging framework (#471)
• Change multipart controller (#454)
• Allow encoded characters through spring (#478)
• Fix documentation - startup command for Sample Client(#464)
• More stable builds (#476)