A TON of improvements
converted to Maven project
slightly modified API to conform to mike's new standards
fully implemented API in SampleDrawer, and added 3 new methods:
  drawCube(x,y,radius,perspectiveFactor,angle)
  fillCube(x,y,radius,perspectiveFactor,angle)
  fillQuadralateral(x1,y1,x2,y2,x3,y3,x4,y4)
added parsing of formulas for number input
slightly refactored the way scaling/zoom works (still needs work)
and probably more that I forgot about