Openlayers 2.12

Hi, This is OpenLayers-2.12 (latest stable version up to date), added the main libraries and the img theme lib directories following instructions from https://github.com/openlayers/openlayers/blob/release-2.12/readme.md

Source Code: https://github.com/openlayers/openlayers/tree/release-2.12
http://www.openlayers.org/download/OpenLayers-2.12.tar.gz