Add support for TI SimpleLink platform (CC3200 Launchpad board)

[ivankravets]

Moved from platformio/platformio-core#323

/cc @berezovskyi

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Hi,

I would love to see CC3200 Launchpad supported by PlatformIO!

I looked through the platforms and boardsdirectories in the source tree and new work seems to consist only of crafting proper JSON files? If it is so, I could try doing it myself initially.

Did you have a chance to work with the SimpleLink platform before?

[vshymanskyy]

This would be great ;)