Added .eslintrc and minor lint fixes
Fix includes files for TileMap object
Renamed Polygon files to Polygon2d
Fix a bug with mono-bitmaps in TileMapObject
Merge pull request #24 from victorlevasseur/tilemapobject/master

Fix bug with mono-bitmaps in TileMapObject
Merge branch 'master' into polygon-edition-helper
Merge branch 'master' into polygon-edition-helper
Fix polygon include in PolygonEditionHelper