Project sanity check (#76)

* tslint: CRLF -> LF

* gitignore more build artifacts

* Add proposed .editorconfig

* Allow for "clean" builds

src/ts/generated/ content is still required (sprites.ts,
gamepad-mappings.ts), but src/scripts is not.

* Add --sprites option to production build

* Add note about sprites to README

src/ts/tools/canvas-utils.ts

@@ -1,4 +1,7 @@
+/// <reference path="../../typings/my.d.ts" />
+
 import * as fs from 'fs';
+import * as path from 'path';
 import { createCanvas, Image } from 'canvas';
 import { ExtCanvas, Point } from './types';
 
@@ -167,6 +170,12 @@ export function isCanvasEmpty(canvas: ExtCanvas | undefined): boolean {
 }
 
 export function saveCanvas(filePath: string, canvas: HTMLCanvasElement) {
+	try {
+		fs.mkdirSync(path.dirname(filePath), { recursive: true });
+	} catch (e) {
+		if (e.code !== 'EEXIST') throw e;
+	}
+
 	fs.writeFileSync(filePath, canvas.toBuffer());
 }