Optimise images (591 KB reduction)

Hi, tsgates.

I've taken the liberty of putting git-emacs'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 66 optimisable images, making a 591 KB reduction in size. That's about 30.07% of your total image assets.

Merry Christmas.

<table><tr><th>Name</th><th>Reduction</th></tr><tr><td>branch1.png</td><td>29.05%</td></tr><tr><td>branch10.png</td><td>31.78%</td></tr><tr><td>branch11.png</td><td>18.75%</td></tr><tr><td>branch2.png</td><td>31.93%</td></tr><tr><td>branch3.png</td><td>32.83%</td></tr><tr><td>branch4.png</td><td>32.89%</td></tr><tr><td>branch5.png</td><td>30.66%</td></tr><tr><td>branch6.png</td><td>29.06%</td></tr><tr><td>branch7.png</td><td>31.96%</td></tr><tr><td>branch8.png</td><td>33.35%</td></tr><tr><td>branch9.png</td><td>31.27%</td></tr><tr><td>clone0.png</td><td>29.76%</td></tr><tr><td>clone1.png</td><td>29.12%</td></tr><tr><td>clone2.png</td><td>33.73%</td></tr><tr><td>clone3.png</td><td>31.24%</td></tr><tr><td>clone4.png</td><td>31.37%</td></tr><tr><td>clone5.png</td><td>29.28%</td></tr><tr><td>commit1.png</td><td>28.18%</td></tr><tr><td>commit2.png</td><td>28.80%</td></tr><tr><td>commit3.png</td><td>31.90%</td></tr><tr><td>commit4.png</td><td>33.32%</td></tr><tr><td>config-init.png</td><td>32.06%</td></tr><tr><td>config-init2.png</td><td>33.90%</td></tr><tr><td>delete1.png</td><td>33.93%</td></tr><tr><td>delete2.png</td><td>33.61%</td></tr><tr><td>diff1.png</td><td>28.51%</td></tr><tr><td>diff2.png</td><td>29.86%</td></tr><tr><td>diff3.png</td><td>30.84%</td></tr><tr><td>diff4.png</td><td>18.05%</td></tr><tr><td>diff5.png</td><td>22.45%</td></tr><tr><td>history1.png</td><td>31.55%</td></tr><tr><td>history2.png</td><td>29.09%</td></tr><tr><td>init-archive1.png</td><td>31.86%</td></tr><tr><td>init-archive2.png</td><td>28.14%</td></tr><tr><td>init-archive3.png</td><td>31.40%</td></tr><tr><td>init-archive4.png</td><td>29.06%</td></tr><tr><td>init-archive5.png</td><td>31.97%</td></tr><tr><td>init-archive6.png</td><td>31.33%</td></tr><tr><td>init-archive7.png</td><td>30.86%</td></tr><tr><td>merge1.png</td><td>28.35%</td></tr><tr><td>merge2.png</td><td>23.56%</td></tr><tr><td>merge3.png</td><td>25.34%</td></tr><tr><td>merge4.png</td><td>23.26%</td></tr><tr><td>merge5.png</td><td>31.10%</td></tr><tr><td>regexp-select1.png</td><td>31.69%</td></tr><tr><td>regexp-select2.png</td><td>33.97%</td></tr><tr><td>status-ignore.png</td><td>31.45%</td></tr><tr><td>status-ignore1.png</td><td>32.34%</td></tr><tr><td>status-summary.png</td><td>32.43%</td></tr><tr><td>status1.png</td><td>33.72%</td></tr><tr><td>status2.png</td><td>31.61%</td></tr><tr><td>status3.png</td><td>31.05%</td></tr><tr><td>status4.png</td><td>32.46%</td></tr><tr><td>status5.png</td><td>32.22%</td></tr><tr><td>status6.png</td><td>29.42%</td></tr><tr><td>status7.png</td><td>31.23%</td></tr><tr><td>status8.png</td><td>30.56%</td></tr><tr><td>tag1.png</td><td>28.39%</td></tr><tr><td>tag2.png</td><td>27.13%</td></tr><tr><td>tag3.png</td><td>31.27%</td></tr><tr><td>tag4.png</td><td>28.52%</td></tr><tr><td>tag5.png</td><td>33.22%</td></tr><tr><td>tag6.png</td><td>30.96%</td></tr><tr><td>tag7.png</td><td>30.42%</td></tr><tr><td>tag8.png</td><td>30.68%</td></tr><tr><td>tag9.png</td><td>28.91%</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)