Recent Commits to styleguide:gh-pages

LICENSE: switch to CC-BY-3.0 #637

We've always said the style guides are licensed under CC-By 3.0 in
our README file.  We use other licenses for code snippets, and list
those in the respective file headers, but the guides are the dominant
source in this repo, so list that in the LICENSE file.

Fixes #637.

pylintrc: add explicit Apache license for export #637

Most content in the external styleguide repo is Creative Commons based,
so add an explicit license to files that aren't to avoid confusion.