Battery performance indoors

[gpgis]

If you don't turn off the gps location while you are indoors the application can drain your battery quite quickly. I was indoors with the application running in the background of my phone and 33% of battery was drained in 2 hours.

It would be nice if the gps signal has been lost and doesn't reconnect after x number of attempts that the application would automatically turn off the location gathering. The application should have some indication that the gps has been turned off and an easy way for the user to turn it back on when they go back outside.

Another alternative would be to turn the gps signal off when the application is running in the background on the mobile device.

[JohnHasthorpe]

Internal issue raised: #15