Changed svg width and height to 900
Index.html now includes common/grid.js
Overhauled app.js to use Grid and GridCell objects
Changed GridCell constructor to accept an array of options instead of multiple arguments
Added setters for the dimension, offset and position of a GridCell
Refactored setStatus to also set the stroke and data-status attribute
Made it so that the Grid constructor populates the Grid.grid array
Changed Grid.addGridCell to accept a param object instead of multiple arguments
Set the startingGridCell with status 'frontier' instead of 'start'
Added Grid.getGridCells() function