Add a spinner while creating a machine
use sudo prefix variable, fixes missing sudo on systems
Merge branch 'staging' of https://github.com/mistio/mist.io into staging
improve name validation on create machine wizzard
Show ajax loader and disable "Add Key" button, when machine is being created
Fix single machine view stuff.

- Add a missing semicolon and set pendingCreation to false on machine creation failure
- Properly update machine_manage_keys dialog for new key, when new machine is created
- Set pendingCreation to false on machine destruction
- Fix ajax loader positioning in various resolutions
- Rewrite code using less lines
git Merge branch 'staging' of https://github.com/mistio/mist.io into staging
Merge branch 'staging' of https://github.com/mistio/mist.io into staging
fix args for Rackspace drivers