Renaming file COPYING to LICENSE and appending the disclaimer from...

Renaming file COPYING to LICENSE and appending the disclaimer from src/common/convert_UTF.h to LICENSE.

R=mark@chromium.org

Review URL: https://breakpad.appspot.com/1174003

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1285 4c0a9323-5329-0410-9bdc-e9ce6186880e