issue #3: added unit test for null values in Report parcel
issue #3: removed unnecessary instance variables
issue #3: modified ReportListFragment to receive local broadcasts about report list updates
issue #3: minor cleanup
issue #3: fixed null pointer on thumbnail in list and grid views
issue #3: changed ReportUnzipRunnable to allocate only one byte buffer for reading/writing zip entries per zip file to avoid triggering so many GC_FOR_ALLOC garbage collection messages
issue #3: added broadcast receiver to ReportGridFragment to update the grid when the report list changes
issue #3: fixed grid view use of other report's thumbnail for a report with no thumbnail