When the user re-opens Formulize after the application has been destroyed, it should return to the last page the user opened, with their connection re-established, so user won't lose track of their place in the application.

[timch326]

• If the user did not save their credentials, they need to be re-prompted for their login before restoring state.

What (might) needs to be done:

• On every activity, when the application is onPause(), save the current activity to the preferences, along with the current connection being used.
• ScreenListActivity needs to be refactored so it doesn't have to take in a FormulizeApplicaiton object to work. Instead it should be able to take the ConnectionInfo, and application ID and query for the information itself.
• applist.php needs to take additional parameters to just return the screen of a specific application ScreenListActivity.
• A "stater" activity should be added to read from the current preferences, so it returns the proper activity and connection that the user last opened.