Open-source the test suite

[tailhook]

It would be cool to publish a test suite along the spec. So alternative implementations could adhere to it.

My use case is to implement the language interpreter in Rust.

(This is kinda promised by @armon on twitter https://twitter.com/armon/status/914498973129428992, just adding an issue to track progress).

[mitchellh]

Sorry this took so long but I agree completely that we should open source the specification test suite. We have a fully automated suite we run against our runtime to test against the specification. It doesn't have full coverage (as you found in #5, but that fix actually added that coverage) but it does have over 200 test cases currently.

I'll work on adding this to the SDK.

[cristim]

@mitchellh also while at it why not just open source the sentinel implementation as well?