Merge pull request #6 from ceph/master

Rebase from upstream
Merge pull request #7 from matthewrees/master

Rebase on master
Support for 100-continue toggling for RGW

Tested for Precise and Trusty.
Change to shell from command
Replaced shell based sed with apt_repo module call
Merge pull request #151 from matthewrees/100-continue

Support for 100-continue toggling for RGW