manual merged changes from '0b1a46d'
rehost the marker images
listeners, vehicles and horizon circles on map
working tracker, prediction drawing not complete
Mobile Tracker now integrated with GMap API 3

Closes #2

* updated build.sh
* lowered the size of target*.png to 30x30 px
* removed a lot of legacy code
* optimized a lot of the routines
* implement follow functionality, which replaces pan on expand
* map is more responsive and snappy across devices

* fixes dragging issue on android devices; Closes #4
* horizon range drawing is handled by google api, which will
  properly visualize it over the projection; Closes #11
* enabled zoom slider; Closes #13
Merge branch 'gmaps3_port'

Conflicts:
	js/mobile.js
	js/tracker.js

Conflicts were because of a single ','

*sigh*