Implement the new bundler index

by Felipe Tanus for Ruby

This is a project to implement the new index helper proposed and prototyped by André Arko. This index will allow Bundler to do exactly what it does today but using less network and server resources. In the end we will have all necessary implementation done and a test version. The objective of this project is make rubists happier by using a faster bundler, and bundler developer hapier by not having to lose their sleep.