Add related projects section

[chrisdwheatley]

This covers #1102 by adding the suggested links to the readme.

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[chrisdwheatley]

I signed it!

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CLAs look good, thanks!

[ebidel]

Thanks for the contribution @chrisdwheatley!

Wonder what you/others think about enabling the wiki and we can have folks add their projects there? We did something similar for https://github.com/Polymer/polymer/wiki/Who's-using-Polymer%3F.

[paulirish]

IMO readme gets like 100x more eyes than wiki. I think we should only move this data to the wiki once we have like > 20 items to put here.

i <3 having this stuff in the readme like this.

@ebidel sgty?

[paulirish]

@chrisdwheatley thx for the ez pz contribution! really appreciate it.

looking at https://www.npmjs.com/browse/depended/lighthouse i wonder if there's anything else worth adding. maybe lighthouse-batch?

[ebidel]

SG. Readme is also good for our npm landing page. You can also add https://github.com/ebidel/lighthouse-hue :)

[paulirish]

did a followup commit: 342398c