v1.31.0
730f13a Release v1.31.0.
a694af6 updated dependencies to achieve JDK 11 compatibility
0b6b3d7 fixed checkstyle errors
842e99b fixed SAML SP ACS URL should default to SP entityID
f03ff3e cleaned up unused SAML configuration properties
d91715a added support for SAML authentication
23aa141 added SAML prefix, ldap and saml provider strings for user objects
16c87b9 fixed appid parameter in LDAP auth filter
44821f5 enabled authentication error propagation back to clients
10d2f15 fixed possible NPE, cleaned up logging
3068b19 refactored batchDelete method in AWSDynamoDAO