Alpha 14-b. data/login-service based on indexedDB

[lisaslyis]

• Demo button is added in home.html to load mock-data.
• All of the data/login-service functions are asynchronous.
• get...List function will pass a list of data in a callback
• get function will pass an object with data and functions in a callback.

eg)
dataService.get('user', 'user1@gmail.com').then(function(obj) { //callback
    console.log(obj.data);             // obj.data has all data
    obj.addUserTag(something);  // This function will add a tag to obj.data.tags
    obj.save();                              // This function will save obj.data in disk
});