Fixed sizing issues with the LoginPrompt and ViewChildren

The LoginPrompt is now correctly sized to hug its content

The ViewChildrenView no longer displays tiles beyond the
visible portion of the screen.
Created a ServerRequest Object to handle server requests

For testing, when the the Login screen is loaded, a Server
Request is sent to check whether or not the application can
connect to the server
Merge branch 'ServerRequest' into development
Added ServerRequestDelegate Protocol
Changed CoreData Model to include Sessions

IMPORTANT:
This commit contains errors
Fixed a warning in the ServerRequest class
App is now stable and has the icon assets for the graph screen.

TODO: Implement the graphing