Calculator v.1.0 - has been released

I've found another bug. Adding dollar ammounts seems to confuse the plugin. For instance, 50.00 + 11.60 returns 61.599998, not 61.6 as other calculators would. However, I would prefer to have the calculator plugin give answers using the same number of decimal places given from the arguments. I.e. in this case, return 61.60, because both arguments were given with 2 decimal places.