,.
added refresh functionality for all pages
Datepicker added, listener now contains getContext()
Register added to parent Activity, Login functionality added.
Registration, logout added to menu, RequestCodes added,
network interaction enhanced with new RequestCode workflow.

request codes are sent to server, and received to keep track of request
Source.,
different types of requests are sent to server from single activity. So,
the source must be known after the response has been received, Based on
request code response is processed