Pulled in code for more optimized image loading and caching. (Thanks mspielberg!)

Changes the tractors to a green and yellow paint scheme; fixed the yellow striping on the front.

0.9.2: Fixed AC unit on Amazon Prime and Maersk containers; 0.9.1: Added Maersk container by Jason-118.

Contains a container skin template with the corresponding models. Only the top 2048x2048 part of the texture is used by the mod. The remaining part of the texture should be a solid color for compression. (0.9.2: Fixed the AC unit texture.)

All you need to do to enable the default skin for a particular container type is add a folder named "Default" in it.

0.9.2: Tweaked AC textures. Contains: CMA CGM, Evergreen, Hapag-Lloyd, Maersk