Added index.html in root for translation 'KO'.
Translated 'index.html' into Korean
Added a profile 'cwdoh'.
Translated top index html into Korean
Added '_ko/fundamentals/getting-started/your-first-multi-screen-site' for translating Korean.
Better Korean expression of 'best practices'.
Copied '_code' into '_ko/.../your-first-multi-screen-site'.
Translated index.markdown of first multiscreen site into Korean.
Translated content.markdown of first multiscreen site into Korean.
Translated index.markdown of getting-started site into Korean.
Use DevTools updates
Add myself as a contributor
Merge pull request #737 from umaar/add-contributor

Add myself as a contributor
Allow for translated betterbook files

Builds a path to title mapping, and uses it in preference of the core betterbook.
Handle other languages in include_code
Merge pull request #738 from umaar/use-devtools-updates

Use DevTools updates
Translated /getting-started/your-first-multi-screen-site/index.markdown into Korean.
Translated /getting-started/your-first-multi-screen-site/responsive.markdown into Korean.
Removed files in `_code` directory that are unnecessary.
Update _contributors.yaml to resolve merge conflict.