Rolling update & multi-endpoint support

This update adds two major features:

• Near-zero downtime project updates
• Support for multiple endpoints

Deployment tokens release

This release adds support for deployment tokens.

Tokens are useful for deploying things from environments that don't have your private key (e.g. CI/CD services).
Here's how it works:

1. Make sure you are logged in to your Exoframe server
2. Generate new deployment token using: exoframe token
3. Use the new token to deploy your service without need to authenticate: exoframe deploy -t $TOKEN