Included drum sounds in the grids.

1. Drums are now auto-included on the second grid addition.
2. Server was updated to include routes for serving the drum tracks
3. An import drum track file was added to import the files and store them
4.  Changes were made to the Chats and Grid controller to be compatilbe with drums
5. an if/else statement was added in the toggle and grid.js functions to be compatible with drum sounds.