Pass license check script for most of the tree.

Modified license-checker script to allow pruning directories
we know to be ok.

Still need to do a bit of third_party/* , as well as
file a bunch of bugs on pieces where the licenses aren't clear,
but I'm running out of energy.

Review URL:

git-svn-id: 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed