Release version 1.8

Release version 1.7

Prevent from having to hit Back twice in order to exit when coming fr…

…om the notification bar.

Allow GPS update interval down to 5 sec.

Warn user about battery.
Closes #17.
=> Version 1.5

Tolerate devices which sometimes send GPS updates 1 second too early.

(such as HTC One Mini)

Use toLocaleString instead of concatenating date & time.

Release version 1.3

Bump version 1.2

version 1.1.3

Prevent from entering insane numbers in the prefs (> 99999)