Implemented Level 1 of front-end challenge.

Implemented Level 1 of front-end challenge. Added new game button. Implemented drag-n-drop support using jQuery UI. Fixed loading of Font Awesome (linked CSS in index.html). Added simple test to ensure valid number of pieces are placed. Manually tested drag-n-drop functionality. Added basic CSS styling for game pieces. Added multi-dimensional array for storing rows/columns. Drag-n-drop functionality updates tile objects in scope to indicate which tiles have a red/white game piece. AngularJS redraws view when tiles are updated to move game pieces.