Parsoid/C++/Skel

The scope of this project is simply to write an empty prototype that the parsoid can be built on top of. Acceptance requirements are,
 * 1) Contrib libraries are redistributed and built
 * 2) These libraries are packaged together with our code into a single libparsoid.
 * 3) (stage 2) Our library routines are bound from PHP and can make callbacks.

TODO

 * Make system
 * Top-level makefile always rebuilds contrib projects
 * Libtool will solve the issue of linking against dynamic libraries that are locally installed.
 * Decide what to use at the top level: autoconf, cmake, or a plain makefile?
 * PHP bindings project config.m4 and config.w32 haven't been configured yet.
 * Determine the architecture of callbacks made to php.
 * Test framework
 * parsertests.txt, round tripping
 * thread locking and shared memory, heap scrambling
 * DOS conditions
 * Job management
 * priorities, background dataflow re-evaluation