Remove cached gem before install.
Remove cached gem before install.

The gem command only updates the cached version when the version
changes, and bundler uses the cached gem when vendoring. Without this
change, it's easy to get stale dev versions of the gems in an uberjar.

samwgoldman/torquebox,mje113/torquebox,torquebox/torquebox-release,vaskoz/torquebox,mje113/torquebox,torquebox/torquebox-release,torquebox/torquebox-release,samwgoldman/torquebox,torquebox/torquebox,torquebox/torquebox,torquebox/torquebox,mje113/torquebox,torquebox/torquebox-release,ksw2599/torquebox,samwgoldman/torquebox,vaskoz/torquebox,ksw2599/torquebox,torquebox/torquebox,mje113/torquebox,vaskoz/torquebox,samwgoldman/torquebox,ksw2599/torquebox,ksw2599/torquebox,vaskoz/torquebox