Update the copyright coredits -- Happy new year 2013!

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@171342 91177308-0d34-0410-b5e6-96231b3b80d8
Updating CREDITS.TXT

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@171347 91177308-0d34-0410-b5e6-96231b3b80d8