Geosphere version 3.1

[markb]

This version offers improved iOS 7 compatibility as well as the ability to select between Apple and Google Maps.

New map features:
-Support Google maps (Standard, Satellite, Hybrid, Terrain).
-Map overlays for heading, locating target & minimum cache separation (0.1 mi).
-Pin overlay (blue 'X' ) displayed if you've logged a DNF.

Importing:
-Separate settings for preloading cache, trackable & log images.
-Ability to scale down large downloaded images.
-Improved handling of corrected coordinates.
-Improved handling of additional waypoints.

Filters:
-Expanded Favorites range.
-Added "I Attached Local Image" offline filter.

Misc:
-Reduced compass calibration prompts.
-Ability to manage memory usage.
-Various minor improvements and bug fixes.