Implemented Dijkstra pathfinding in Grid.prototype.getPathBetween. Pieces now walk along that path when moved and update action point readout appropriately.
Adds 'targetable' css class to '.grid-cell' object. Highlights enemies within range. Creates Volley object to manage hit probability/success.
Bit of cleanup.
Adds rudimentary shooting.
Merge branch 'master' of https://github.com/bpander/TBSGame into gh-pages