Optimise images (236 KB reduction)

Hi, rowanj.

I've taken the liberty of putting gitx'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 26 optimisable images, making a 236 KB reduction in size. That's about 33.87% of your total image assets.

Merry Christmas.

<table><tr><th>Name</th><th>Reduction</th></tr><tr><td>AddBranchTemplate.png</td><td>95.39%</td></tr><tr><td>AddLabelTemplate.png</td><td>94.42%</td></tr><tr><td>CommitViewTemplate.png</td><td>94.16%</td></tr><tr><td>DetailViewTemplate.png</td><td>93.55%</td></tr><tr><td>HistoryViewTemplate.png</td><td>95.03%</td></tr><tr><td>Updates.png</td><td>17.11%</td></tr><tr><td>deleted_file.png</td><td>89.47%</td></tr><tr><td>empty_file.png</td><td>88.22%</td></tr><tr><td>new_file.png</td><td>41.13%</td></tr><tr><td>branch-lanes.png</td><td>57.46%</td></tr><tr><td>branchswitcher.png</td><td>64.13%</td></tr><tr><td>commitview.png</td><td>22.26%</td></tr><tr><td>detailswitcher.png</td><td>91.79%</td></tr><tr><td>display_diff.png</td><td>51.15%</td></tr><tr><td>gistie.png</td><td>47.12%</td></tr><tr><td>gitx.png</td><td>28.72%</td></tr><tr><td>historyview.png</td><td>23.21%</td></tr><tr><td>left-right.png</td><td>22.37%</td></tr><tr><td>menubar.png</td><td>60.50%</td></tr><tr><td>quicklook.png</td><td>90.13%</td></tr><tr><td>viewswitcher.png</td><td>47.44%</td></tr><tr><td>bg.png</td><td>44.92%</td></tr><tr><td>download.png</td><td>19.19%</td></tr><tr><td>header.jpg</td><td>59.88%</td></tr><tr><td>qtime.png</td><td>28.28%</td></tr><tr><td>spinner.gif</td><td>32.81%</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)