- Added calculation of optimal strategy for computer's turn. Not
  working since empty columns aren't removed from tokens array.
- In removeTokens function, removed code that assigned null to empty
  columns. Instead, added code to decrement the heap property of all
  the tokens that are after the empty column. Also called splice
  method on tokens array to remove the empty column from the tokens
  array so that the array is always valid and representing of the
  remaining tokens.
- Renamed Token object properties column and token to heap and order
- Renamed the parameters of removeTokens function from col and tok
  to column and row
- Renamed maxColumns to maxHeaps
= Renamed numOfCol to numOfHeaps
- Improved comments of removeTokens function
- Optimal computer strategy only works when the computer wins. If
  player can win, before he can do so, the computer references invalid
  token array indices.

  startCompTurn function changes:
	- Removed subtraction of one in selectedTok assignment
	- Removed the check for remaining tokens using null. Instead added
	  check to see if the tokens array length is zero.
- Fixed optimal strategy for computer move by checking if nimSumAll
  is zero, and if so, getting random selection
- Added check at end of computer's turn to see if it took the
  last token(s)
- Improved comments for startCompTurn function
- Updated CHANGES and README to 0.7.0
- Updated date in main.js