Add CODEOWNERS file to help automate reviews.
Add CODEOWNERS file to help automate reviews.

Documentation from GitHub: https://help.github.com/articles/about-codeowners/

jekyllbot does too much already -- I'd like to see GitHub help us keep organized.
This is also an exercise in logically splitting up the codebase. The build team
is pretty overloaded it looks like -- can we split anything out?

jaybe-jekyll/jekyll,jekyll/jekyll,alex-kovac/jekyll,chrisfinazzo/jekyll,chrisfinazzo/jekyll,getandpost/jekyll.github.io,getandpost/jekyll.github.io,getandpost/jekyll.github.io,gencer/jekyll,fulldecent/jekyll,ryanshaw/jekyll,Strangehill/jekyll,tillgrallert/jekyll,alex-kovac/jekyll,alex-kovac/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll,Strangehill/jekyll,alex-kovac/jekyll,x-way/jekyll,chrisfinazzo/jekyll,tillgrallert/jekyll,x-way/jekyll,jekyll/jekyll,ryanshaw/jekyll,tillgrallert/jekyll,ryanshaw/jekyll,jekyll/jekyll,fulldecent/jekyll,jaybe-jekyll/jekyll,gencer/jekyll,ryanshaw/jekyll,jekyll/jekyll,yhironaka/yhironaka.github.io,Strangehill/jekyll,gencer/jekyll,gencer/jekyll,gencer/jekyll,x-way/jekyll,tillgrallert/jekyll,fulldecent/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll,fulldecent/jekyll,alex-kovac/jekyll,tillgrallert/jekyll,x-way/jekyll,chrisfinazzo/jekyll