Use Fedora's Copr to provide builds

[kruton]

Fedora has a nice system called Copr (Cool Other Package Repository) that will automatically build packages for all Fedora versions using their infrastructure. Consider using this so we can even have Rawhide versions!

[jamespo]

yum on centos 6 complains when trying to use your repo:

https://dl.bintray.com/tatsushid/h2o-rpm/centos/6/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found" Trying other mirror.