Using a non managed cache due Weld 2.2.6 behavior under Wildfly 8.2

New version of Weld (2.2.6), that implements CDI 1.2 dislike generics from interfaces. So we got an error when deploy our applications under Wildfly 8.2. So I've change the code to use non managed cache.

Closes #897
what if an app or plugin code use this annotation?

This is a major compatibility break, since we didn't even deprecate it.