Add example Map/Reduce and Distributed execution benchmarks

Update plugin dependencies
Modify Infinispan 7 configuration file to reflect current configuration
Modify IndexDocument to handle names that include a "/" character
I know I've said you can put the demos into dependencies, but it seems to me that it would be better to place this into a profile that would be by default on (in order to have smooth example configs) but could by disabled by -Dno-demos