Upgrade Tyrus dependencies to align with Spring 4.1's requirements

Tyrus has been updated to 1.3.5 (from 1.2.1). The tyrus-websocket-core
module does not exist in 1.3.5. For backwards compatibility,
dependency management for this module is still provided at version
1.2.1.

Closes spring-io/platform#32
Merge branch '1.1.x'