Optimise images (254 KB reduction)

Hi, facebook.

I've taken the liberty of putting xhprof'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 6 optimisable images, making a 254 KB reduction in size. That's about 23.55% of your total image assets.

Merry Christmas.

<table><tr><th>Name</th><th>Reduction</th></tr><tr><td>sample-callgraph-image.jpg</td><td>26.20%</td></tr><tr><td>sample-diff-report-flat-view.jpg</td><td>21.84%</td></tr><tr><td>sample-diff-report-parent-child-view.jpg</td><td>24.19%</td></tr><tr><td>sample-flat-view.jpg</td><td>22.04%</td></tr><tr><td>sample-parent-child-view.jpg</td><td>26.34%</td></tr><tr><td>indicator.gif</td><td>7.60%</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)