- Updated CHANGES and README to 0.8.1
- In unHighlight function, changed check to see if tokens[column] is
  valid by using typeof operator and identity (!==) operator with
  string 'undefined'
- Added comment in startCompTurn when calling removeTokens
Fixed minor warnings from JSHint linting

- Removed extraneous variable declarations inside initialization part
  of for loops. (ie for (var i=0;...)) Since JS doesn't have block
  scope, it is superfluous to always declare variables inside the
  initializer of for loops. Thus they are now declared once, and
  initialized to zero when needed subsequently.

- Replaced == with === to ensure data type equality and better coding
  practice

- Added missing semi-colons in anonymous functions of event listeners

- Removed mixed spacing within tabs
Removed duplicate declarations of selected{Col, Tok}

Grouped all variable declarations at beginning of startCompTurn function
in one var statement with identifiers separated by commas
Grouped variables in startGame() under one var