Update README.md

Added license description
Update README (@Http's uriTemplate parameter is now called uri).
Merge pull request #167 from elandau/master

Clean up usage of Rx and add support for retrying HTTP 503
Merge pull request #183 from Trundle/update_readme

Update README (@Http's uriTemplate parameter is now called uri).
[Gradle Release Plugin] - new version commit:  '2.0-RC11'.
Merge branch 'master' of https://github.com/Netflix/ribbon

Conflicts:
	gradle.properties