Open models remain available if not closed when page unloads

[mmacfadden]

Versions
Please fill in all that apply:

• Convergence Version: 1.0.0-rc.4

Describe the Bug
Open models are always available locally. If you have model open and then uncleanly unload the page without closing models or disposing the domain. The logic that removes the local model does not get triggered. When you reload the page, the model is listed as available.

Step To Reproduce
A code snippet or gist to reproduce the issue will greatly improve our response time

1. connect online.
2. open a model.
3. Refresh the page.
4. Connect online.

Expected Behavior
The model should not be there anymore. It seems like upon initialization we should purge models like this.