Add option to define if sourcemaps should be generated fixes #42 (#48)

README.md

@@ -21,6 +21,7 @@ By default the service worker will be generated for production builds and the se
 ENV.serviceWorker = {
   enabled: true,
   debug: true,
+  sourcemaps: true,
   precacheURLs: ['/mystaticresource'],
   excludePaths: ['test.*', 'robots.txt',],
   fallback: [
@@ -43,6 +44,7 @@ ENV.serviceWorker = {
 The following options are available:
 * **enabled** - Generate service worker.  Defaults to true in production.
 * **debug** - Display debug messages in console.
+* **sourcemaps** - Boolean that defines if sourcemaps should be generated. Defaults to the same value of debug.
 * **precacheURLs** - Array of URLs to precache and always serve from the cache.  broccoli-serviceworker will automatically add all Ember app resources (e.g. files in dist) as precached URLs unless explictly excluded in excludePaths.
 * **excludePaths** - Array of paths to exclude from precache.  Files can be filtered using regular expressions.
 ```JavaScript

lib/service-worker.js

@@ -22,6 +22,7 @@ var BroccoliServiceWorker = function BroccoliServiceWorker(inTree, options) {
   this.cacheOnlyURLs = options.cacheOnlyURLs || [];
   this.fastestURLs = options.fastestURLs || [];
   this.debug = options.debug || false;
+  this.sourcemaps = options.sourcemaps || this.debug;
   this.networkFirstURLs = options.networkFirstURLs || options.dynamicCache || [];
   this.excludePaths = options.excludePaths || ['tests/*'];
   this.fallback = options.fallback || [];
@@ -50,6 +51,7 @@ BroccoliServiceWorker.prototype.write = function(readTree, destDir) {
   var cacheFirstURLs = this.cacheFirstURLs;
   var cacheOnlyURLs = this.cacheOnlyURLs;
   var debug = this.debug;
+  var sourcemaps = this.sourcemaps;
   var networkFirstURLs = this.networkFirstURLs;
   var fallback = this.fallback;
   var rootURL = this.rootURL;
@@ -133,7 +135,7 @@ BroccoliServiceWorker.prototype.write = function(readTree, destDir) {
       lines.push(getFileContents('log-debug.js'));
       fs.writeFileSync(path.join(destDir, serviceWorkerFile), lines.join("\n"));
       fs.writeFileSync(path.join(destDir, toolboxLocation), fs.readFileSync(swToolboxFile));
-      if (debug) {
+      if (sourcemaps) {
         fs.writeFileSync(path.join(destDir, 'sw-toolbox.js.map'), fs.readFileSync(swToolboxMapFile));
       }
     });