add a parser option for typscript

[matthewrobertson]

Create a new parser option for typescript that uses the typescript plugin for babylon

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[skovhus]

Is this an alternative to the recast parser suggested here #239 (comment)

[domoritz]

Is anyone looking at this? It would be great to have support for Typescript.

[fkling]

@domoritz Typescript support was just added in the latest version (v0.6.0). I picked the changes from #286 instead of this one (sorry @matthewrobertson).