Add gyp and AUTHORS files.

Start using gyp to build the project. https://code.google.com/p/gyp/

List authors in one file rather than at the top of every file.

TEST=
To generate a Visual Studio solution for ETW2CTF:
1. Get gyp: "svn co http://gyp.googlecode.com/svn/trunk gyp"
2. Run gyp: "gyp/gyp --depth=. etw2ctf.gyp"

R=etienneb@chromium.org, fw.centrale@gmail.com

Review URL: https://codereview.appspot.com/14378043