[GSOC 2014][JSON] Current work of supporting JSON output

[yangmin zhu]

Hi all,
 I had cleaned and refactored my code and I think it's time to send the patches
to the mailing list for a review.
The code are still immature and need to change a lot and I send them
here mainly for
discussion before my next step, I think it's necessary to get your
feedback and suggestions,
and It's also important to make sure I'm in the right direction.

You can also view my work from [1] or simply clone it back to have a test.
[1] https://github.com/zym0017d/strace_GSOC/commits/devel

Thank you!
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YangMin