Add a python (tarfile) based tar/untar
Add a python (tarfile) based tar/untar

This CL adds a module which can be used to tar and untar files such as the toolchain which may contain symlinks and hardlinks in a platform independent way.  Symlinks are windows are treated as Cygwin style links to enable the toolchain.
Review URL: http://codereview.chromium.org/8786012

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@7348 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client