added the ability to simulate time
added the ability to simulate time

By calling setSimulatedNanoTime(long) before 'tick()' or 'toString()',
one can replay a log and compute TPSs

sebastianpacheco/jPOS,barspi/jPOS,imam-san/jPOS-1,fayezasar/jPOS,alcarraz/jPOS,yinheli/jPOS,jpos/jPOS,atancasis/jPOS,sebastianpacheco/jPOS,atancasis/jPOS,bharavi/jPOS,c0deh4xor/jPOS,juanibdn/jPOS,c0deh4xor/jPOS,juanibdn/jPOS,fayezasar/jPOS,atancasis/jPOS,c0deh4xor/jPOS,yinheli/jPOS,imam-san/jPOS-1,bharavi/jPOS,jpos/jPOS,juanibdn/jPOS,bharavi/jPOS,jpos/jPOS,yinheli/jPOS,alcarraz/jPOS,sebastianpacheco/jPOS,barspi/jPOS,poynt/jPOS,barspi/jPOS,alcarraz/jPOS,poynt/jPOS,poynt/jPOS,imam-san/jPOS-1