Optimise images (336 KB reduction)

Hi, jasonroelofs.

I've taken the liberty of putting ogrerb's image assets though a range of optimisation tools. Image optimisation allows us to reduce the footprint of images - meaning faster load times at no cost to image quality. It does this by finding the best (lossless) compression parameters, stripping embedded comments, and removing unnecessary colour profiles. [See more](http://port3000.co.uk/imageoptimiser-a-github-bot-to-proactively-op).

I found 46 optimisable images, making a 336 KB reduction in size. That's about 14.23% of your total image assets.

Merry Christmas.

<table><tr><th>Name</th><th>Reduction</th></tr><tr><td>GreenSkin.jpg</td><td>32.00%</td></tr><tr><td>Leaves.png</td><td>15.64%</td></tr><tr><td>MtlPlat2.jpg</td><td>10.22%</td></tr><tr><td>PineLeaves.png</td><td>17.99%</td></tr><tr><td>RZR-002.png</td><td>17.93%</td></tr><tr><td>RustedMetal.jpg</td><td>13.68%</td></tr><tr><td>RustySteel.jpg</td><td>3.80%</td></tr><tr><td>Water02.jpg</td><td>12.39%</td></tr><tr><td>WeirdEye.png</td><td>14.71%</td></tr><tr><td>cel_shading_diffuse.png</td><td>49.29%</td></tr><tr><td>cel_shading_edge.png</td><td>48.18%</td></tr><tr><td>cel_shading_specular.png</td><td>48.18%</td></tr><tr><td>clouds.jpg</td><td>57.24%</td></tr><tr><td>cursor.png</td><td>29.52%</td></tr><tr><td>dirt01.jpg</td><td>12.15%</td></tr><tr><td>flare.png</td><td>15.49%</td></tr><tr><td>gras_02.png</td><td>27.62%</td></tr><tr><td>grass.png</td><td>17.69%</td></tr><tr><td>grass2.png</td><td>12.83%</td></tr><tr><td>grass_1024.jpg</td><td>7.27%</td></tr><tr><td>nx.cube.png</td><td>9.78%</td></tr><tr><td>nx.floor.png</td><td>95.82%</td></tr><tr><td>nx.floor.shadowalpha.png</td><td>37.83%</td></tr><tr><td>nx.skygrid.png</td><td>6.32%</td></tr><tr><td>ogreborder.png</td><td>20.58%</td></tr><tr><td>ogreborderUp.png</td><td>37.72%</td></tr><tr><td>pg_densitymap.png</td><td>23.36%</td></tr><tr><td>pg_terrain.png</td><td>11.13%</td></tr><tr><td>pg_terrain_detail.jpg</td><td>5.34%</td></tr><tr><td>pg_terrain_lightmap.jpg</td><td>7.11%</td></tr><tr><td>pg_terrain_texture.jpg</td><td>9.16%</td></tr><tr><td>pg_terrain_texture2.jpg</td><td>4.68%</td></tr><tr><td>ribbonband.png</td><td>24.14%</td></tr><tr><td>smoke.png</td><td>12.12%</td></tr><tr><td>smokecolors.png</td><td>17.70%</td></tr><tr><td>spacesky.jpg</td><td>0.63%</td></tr><tr><td>spheremap.png</td><td>18.97%</td></tr><tr><td>terrain.png</td><td>21.64%</td></tr><tr><td>terrain_detail.jpg</td><td>5.34%</td></tr><tr><td>terrain_texture.jpg</td><td>6.03%</td></tr><tr><td>texmap2.jpg</td><td>6.45%</td></tr><tr><td>wood7.jpg</td><td>18.56%</td></tr><tr><td>header.png</td><td>26.83%</td></tr><tr><td>redogrehead.png</td><td>31.31%</td></tr><tr><td>ruby.png</td><td>3.47%</td></tr><tr><td>sample.png</td><td>59.01%</td></tr></tr></table>

Tools used: advpng, gifsicle, jpegoptim, jpegrescan, jpegtran, optipng, pngcrush, pngout. This is an automated bot maintained by [@skattyadz](https://twitter.com/skattyadz)