Ignoring sublime files.
Added initial version of cellmap.
Added cellmap interface functions and stubs.
Added initial impl set_cell/clear_cell via gb_trees.
Changed format of the stored data in tree;
Updated set_cell/2 with new format.
Refactored set_cell/3; Implemented count_neighbors/3.
Implemented cell_state/3.
Implemented clear_cell/3.