downgrade to 20140509 with our own patches

because i do not have enough time to disable checksum routines in
rbenv-install. further more, i just do not want to use ruby-build as it
conflicts with package management system in so many ways (fetches files
during build, check the checksum in own way, does not maintain fixes
found in the official package management system, does not respect
PREFIX, you name it).
Merge pull request #305 from reallyenglish/10_1_tomoyukis

downgrade to 20140509 with our own patches