Rename yellowlabtools.js to index.js and change the way to call it

lib/index.js

@@ -0,0 +1,38 @@
+var Q = require('q');
+
+var Runner = require('./runner');
+
+
+var yellowLabTools = function(url, options) {
+    'use strict';
+
+    var deferred = Q.defer();
+
+    if (!url) {
+
+        deferred.reject('URL missing');
+
+    } else {
+
+        if (url.indexOf('http://') !== 0 && url.indexOf('https://') !== 0) {
+            url = 'http://' + url;
+        }
+
+        var params = {
+            url: url,
+            options: options || {}
+        };
+
+        var runner = new Runner(params)
+            .then(function(data) {
+                deferred.resolve(data);
+            })
+            .fail(function(err) {
+                deferred.reject(err);
+            });
+    }
+
+    return deferred.promise;
+};
+
+module.exports = yellowLabTools;