Removed some unnecessary Underscore calls.
Tweak to generateRandomDigitHash method
Added a comment
Added method to find conflict cells in a digit hash

findConflicts now calls this method. Also removed some properties from the
plugin which are no longer necessary.
Removed test function

I am planning to come up with some real tests and put them in a
different file.
Refactored code that tests for win
Fixed a minor bug with moveIsValid

It would return false for a number that is on the grid, even if the
move was valid.
Minor refactoring of code involving peer cells
Slightly simplified findConflictCells method

Initially, I didn’t notice that _.pick can take an array of properties.
Simplified getCells method
Optimized isWin method
Made isWin method able to take a digit hash
Added getUserDigitHash method

It returns a digit hash with only the digits entered by the user.