Map Library updates - Fixes #731

Fixed google maps issues by upgrading hardcoded versions and version detection algorithm.
Fixed geocoding function issues by updating google geocoding API.
Added new geocoding function to fetch elevation from lat lng coordinates. Should be useful for path planning by automagically setting elevation to a fixed value for a group of WP's (maintain height above ground).
Rebranded the library to TauLabs according to the original author wishes.