Origin option can be regular expression (#47)

* Origin option can be regular expression

* Update readme with route origin option Regexp support

README.md

@@ -78,7 +78,7 @@ The following options allow you to specify routes that use [sw-toolbox's built-i
   ```
   * **route** - the url or regular expression for the route.
   * **method** - the HTTP method for the route.  Defaults to **any** which matches all HTTP methods.
-  * **options** - passed to the [route handler](https://github.com/GoogleChrome/sw-toolbox#methods) and are available for example to specify a different origin domain.
+  * **options** - passed to the [route handler](https://github.com/GoogleChrome/sw-toolbox#methods) and are available for example to specify a different origin domain (can use regular expression).
 
 ####Hooks
 The following hooks are available to your service worker code. Implement a hook by defining a `function` by the hook's name and it will be called.

lib/service-worker.js

@@ -190,8 +190,13 @@ function setupRoutes(routeUrls, handler, lines) {
     routeUrls.forEach(function(cacheURL, idx, array) {
       var method = 'any';
       var options;
+      var origin;
 
       if (typeof cacheURL === 'object' && (cacheURL instanceof RegExp === false)) {
+        origin = cacheURL.options && cacheURL.options.origin;
+        if (origin) {
+          cacheURL.options.origin = '[origin]';
+        }
         options = JSON.stringify(cacheURL.options);
         if (cacheURL.method) {
           method = cacheURL.method;
@@ -205,6 +210,10 @@ function setupRoutes(routeUrls, handler, lines) {
         line += options;
       }
 
+      if (origin) {
+        line = line.replace('"[origin]"', printPath(origin));
+      }
+
       line += ');';
 
       lines.push(line);