[close #29] Better Retry/Failure Support for Curl


http://stackoverflow.com/questions/14857407/ruby-trying-to-run-set-command
Do as little work in Detect as possible
v82
Merge pull request #166 from heroku/schneems/clean-detect

Do as little work in Detect as possible
Merge pull request #165 from heroku/schneems/improve-curl

[close #29] Better Retry/Failure Support for Curl
Merge branch 'master' of git://github.com/heroku/heroku-buildpack-ruby