Temporarily using bundler --pre to comply with rubygems 2.0.0
Merge pull request #1080 from padrino/temporarily-use-bundler-pre

Temporarily using bundler --pre to comply with rubygems 2.0.0
Looks like bundler 1.3 has been [released](https://rubygems.org/gems/bundler/versions/1.3.0), let's try again
Reverting memcached dependency to its previous value since it was installing fine.
Merge pull request #1082 from padrino/revert-memcached-to-what-it-was

Reverting memcached dependency to its previous value
Merge pull request #1081 from padrino/go-back-to-regular-bundler

Revert to using stable bundler since 1.3 is out :)
Fixes breadcrumbs del, Closes #1061