Revert "allow user to stop GPS if no reading after 60 seconds"

This reverts commit cf45ca829ac1b38c91fe587843d2e121b90300cc.
Revert "Revert "allow user to stop GPS if no reading after 60 seconds""

This reverts commit 34d1dac808dfd7334c1dad22520241cbec028089.
Merge pull request #4 from dimagi/timed-GPS

Timed gps