closes #29 - casper.open() can now directly handle HTTP authentication parameters in urls

@@ -578,6 +578,16 @@
         open: function(location, options) {
             options = isType(options, "object") ? options : {};
             this.requestUrl = location;
+            // http auth
+            var httpAuthMatch = location.match(/^https?:\/\/(.+):(.+)@/i);
+            if (httpAuthMatch) {
+                this.page.settings.userName = httpAuthMatch[1];
+                this.page.settings.password = httpAuthMatch[2];
+                this.log("Adding authentication for user " + this.page.settings.userName, "info");
+            } else {
+                delete this.page.settings.userName;
+                delete this.page.settings.password;
+            }
             this.page.open(location);
             return this;
         },