Bump version to 0.7.1-dev
Update handling of rackspace credential collection

Move Rackspace credential collection to app/common/rackspace
Style edit
Fix: Add method description
Update: Refactor Array+Mutex into Queue
Fix: Catch client timeout errors for Files.
Fix: Mutex lock/unlock in same thread.
Update required console-glitter version to 0.2.0
Update: Use prompt_filesystem for ssh key select
Update: Use prompt_filesystem for ssh key select
Release 0.7.1