Add a codereview.settings file
Add a codereview.settings file

This means reviews will go to the right place by default when using
gcl/git-cl, and reviews will be updated with a ViewVC URL on commit.

Review URL: http://codereview.chromium.org/3322008
ericmckean/seccompsandbox,cnbird1999/seccompsandbox,ericmckean/seccompsandbox,cnbird1999/seccompsandbox,ericmckean/seccompsandbox,cnbird1999/seccompsandbox