CriminalIntent: continued implementation of action bar
CriminalIntent: converted from LinkedHashMap to ArrayList for
persistence of crime data
CriminalIntent: implemented "up" button
CriminalIntent: implementated rotation handling
CriminalIntent: moved CrimeAdapter to a separate class
CriminalIntent: implemented empty list view and button
CriminalIntent: implemented saving/loading of crime data in a json file
CriminalIntent: modified Crime.toJson() to handle null title values
CriminalIntent: modified Jsonizer to store data on the external media if
available