Recommended approach for upgrading CLI based app?

**I'm submitting a feature request**
- **aurelia-cli version:**
0.14.0

**Please tell us about your environment:**
- **Operating System:**
OSX 10.x|Linux (distro)|Windows [7|8|8.1|10]
- **Node Version:**
6.2.0


- **NPM Version:**
3.8.9


- **Browser:**
all
- **Language:**
all

**Current behavior:**
There is no documented method for upgrading an existing CLI based app when you upgrade the `aurelia-cli` app via `npm install aurelia-cli -g`

**Expected/desired behavior:**
I would expect there would be some kind of way I can update my current CLI based app if I update the CLI and an issue has been fixed, like the .NET Core issue with resolution of the bundle scripts in 0.14

**What is the motivation / use case for changing the behavior?**
There is no way to upgrade a project based on the CLI when an update has been released.