Merge remote-tracking branch 'upstream/master'

Cool!
Merge remote-tracking branch 'upstream/master'

After Cory did his persistence work
Making new branch for deleting markers after some time
Copying information about timer, making some constants for the timer
Deleting youFoundFragment, adding list of dig site markers to top
Made markers be added to digSiteMarkerList
Method to go through expired markers, delete those
Assigning some fields
Got the app to not crash when destroyed and holes disappear
Merge pull request #23 from kyleofori/markers_away

Markers away