Asio deadlock prevention + merged other branches + more

Hi, here is a summary of what is included:

1. Deadlock prevention inside Boost.Asio
  See here https://code.google.com/p/android/issues/detail?id=42735#makechanges
  for more info (we wasted couple of days hunting this bug :-/)
2. Merge from pelya, madadam, dragvs, and Aaron Simmons
3. Include directories are now specified through user-config.jam files only. Also, cleaned up the way these jam files are deployed, no more patches and symbolic links.
4. Added support for boost-1.49xNDK-8e and boost-1.53xNDK-8b and boost-1.53-NDK-8e
5. Nice table inside README.md :)

I tried to compile all of those listed inside README.md (except boost-1.45xNDK-r4Crystax) and they compile fine.

Let me know if you see a problem, I'll try to fix it.