Add fast-test and fast-cover npm scripts

Add alternate test and coverage scripts that skips tests that are slow.

lib/factorioServer/index.spec.js

@@ -73,6 +73,7 @@ describe("class factorioServer/index.js", ()=>{
 	});
 	describe(".createMap(mapName.zip)", ()=>{
 		it("creates a map file as instanceDirectory/saves/map.zip", async function(){
+			/* istanbul ignore if */ if (process.env.FAST_TEST) this.skip();
 			this.timeout(20000); // these test often takes a lot of time in the map creation step (4500 ms on i3 dev system)
 			let relativePath = path.relative('.', __dirname);
 			let server = new factorioServer({
@@ -91,6 +92,7 @@ describe("class factorioServer/index.js", ()=>{
 			return true;
 		});
 		it("supports custom filenames", async function(){
+			/* istanbul igoner if */ if (process.env.FAST_TEST) this.skip();
 			this.timeout(20000);
 			let relativePath = path.relative('.', __dirname);
 			let server = new factorioServer({