Written prototyping matlab code

ADD: initialisation code (initstate.m)
ADD: forming decision arrays (evaluateDecisions.m, evaluateStack.m)
ADD: evaluating decision (placeBoxInStack.m)
ADD: discrete event code (advanceTimeline.m, insertOrdinal, pop.m,
updateTimelineWithBox.m)
ADD: testing code (stackTest.m)
Written discrete event simulation code

ADD: advanceTimeline.m, content.
ADD: checkBEL.m, isTop.m, recursiveEval.m, removeBoxFromStack.m.
Bug Fixes (NOT FUNCTIONAL)