Closes cesanta/smart.js#119

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And add the build to the CI.

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cesanta/mongoose#644, h/t @spuschhof

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It conflicted with Workspace service

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It'll be used for MSP432 as well

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Functions decl must follow comment to be correctly documented

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Doesn't actually work yet, but bits common with CC3200 (SimpleLink) are
moved out.

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Now it can talk to backend as well to the demo device: `LCD.AddLine`,
`LED.Set`, `LED.Get`.

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And only define bits that we need afterwards.

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1) It's broken; most likely in more ways than one
2) It doesn't make much sense as long as we maintain MG_EV_POLL and
   have to traverse the list of connections anyway.
3) In Mongoose, simplicity trumps performance.

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Factor out MG task for clarity and ease of reuse.

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Explicitly loosen them on the "big" platforms.

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This allows the bazel `BUILD` file to coexist on case insensitive
filesystems such as on OSX.

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This is less than ideal, but will do for now.

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