Moving mozrunner and simplejson to a toplevel location.

Moving mozrunner and simplejson to a toplevel location.

To help our licensing scripts understand the layout
of the project, moving things out of pylib directly into
third_party.

Also renaming README to README.nacl

As this location is DEPSed into nacl and then into chrome,
several follow-on CLs will be required to complete the move.

BUG=https://code.google.com/p/chromium/issues/detail?id=138921
TEST=None
R=ncbray@chromium.org,steveblock@chromium.org
Committed: https://code.google.com/p/nativeclient/source/detail?r=9280

[bradn, 2012-07-27 00:29:04]

Note codereview doesn't seem to grok it, but there's an add for each of the two
directories.

[Nick Bray (chromium), 2012-07-27 00:30:00]

LGTM

nit: make it clear this is part of a multistep dance.

[Steve Block, 2012-07-27 09:20:27]

lgtm

Thanks Brad. You could maybe link to
https://code.google.com/p/chromium/issues/detail?id=138921 or a new
nacl-specific bug blocking this?