Demo of intervention in memtable to insert k/v interface.

this currently works only for the get/set commands (no list, range or anything else)
few testing scripts for personal use
memtabl kv interface cleanups
cleanups and add SimpleKV.java
change default configurations for our tests.
commitlog_sync is now batch, with a window of 50ms (instead of 10sec periodic)
also disabled all caches