Cache module

[Harald Wellmann]

I've started working on what might become a new DeltaSpike module for 
caching, see https://issues.apache.org/jira/browse/DELTASPIKE-282.

The sources are at
https://github.com/hwellmann/incubator-deltaspike/tree/hwellmann/deltaspike/modules/cache
If you think this is useful, please let me know what it takes to get 
this stuff into DeltaSpike.

Best regards,
Harald