fix($resource): support escaping of ':' in resource url

So one can how define cors/jsonp resources with port number as:

resource.route('http://localhost\\:8080/Path')

src/Resource.js

@@ -1,16 +1,15 @@
 'use strict';
 
-
-
 function Route(template, defaults) {
   this.template = template = template + '#';
   this.defaults = defaults || {};
   var urlParams = this.urlParams = {};
   forEach(template.split(/\W/), function(param){
-    if (param && template.match(new RegExp(":" + param + "\\W"))) {
+    if (param && template.match(new RegExp("[^\\\\]:" + param + "\\W"))) {
       urlParams[param] = true;
     }
   });
+  this.template = template.replace(/\\:/g, ':');
 }
 
 Route.prototype = {

test/ResourceSpec.js

@@ -52,6 +52,13 @@ describe("resource", function() {
     R.get({a:4, b:5, c:6});
   }));
 
+  it('should support escaping collons in url template', inject(function($httpBackend) {
+    var R = resource.route('http://localhost\\:8080/Path/:a/\\:stillPath/:b');
+
+    $httpBackend.expect('GET', 'http://localhost:8080/Path/foo/:stillPath/bar').respond();
+    R.get({a: 'foo', b: 'bar'});
+  }));
+
   it('should correctly encode url params', inject(function($httpBackend) {
     var R = resource.route('/Path/:a');