Add computed properties for cells

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Change to 1 dimensional array for cells
Make score an array

* Each value is a score adjustment
Move spin button away from new game button
Style changes for layout
Adjust score for devil and coin

* Also allow joker to cover any cell in that column
Can now only use a joker once
First stab at observing horizontal and vertical coverage

* watches for row completion
Diagonal scoring
Get started on tests

* Test were failing due to a dependency on ember data.