Add BSER load/dump support for variants

[wez]

BSER is a local-IPC only serialization format for dynamic data:
https://github.com/facebook/watchman/blob/master/BSER.markdown

Adding support for this to Phenom requires adding load/dump APIs similar to the JSON load/dump API.

It also means adding API support for "Array of Templated Objects". In Watchman, this is achieved simply by storing the template definition as a special property of the object type.

[waywardmonkeys]

That document has moved to https://github.com/facebook/watchman/blob/master/docs/BSER.markdown

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