Add support for SimpleReach measurement

[devdazed]

See #1511 for more information.

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CLAs look good, thanks!

[cramforce]

Ping for @avimehta @rudygalfi

[rudygalfi]

LGTM. @avimehta Can you take a look, too?

[rudygalfi]

http://docs.simplereach.com/dev-guide/implementation/google-amp-implementation appears to be an empty page. What's your timeline for publishing something there?

[devdazed]

We can deploy that page as early as tomorrow. You can view the staging version here: http://docs.staging-001.simplereach.com.s3-website-us-east-1.amazonaws.com/dev-guide/implementation/google-amp

[rudygalfi]

SGTM, thanks!

[rudygalfi]

Just one more comment on the documentation page. After that, I'm willing to LGTM and merge.