Auto run simulations

This commit adds a preference checkbox to direct automatically running outdated simulations when the simulations tab is selected.
The logic will not run simulations that have no motors assigned.

I found that there was plumbing in rocket panel to turn on and off the flight parameter estimates in the design window. I exposed that in the options preferences pane.

![untitled](https://cloud.githubusercontent.com/assets/879404/5513225/59f13b86-87a8-11e4-8dfa-991f97b8e9cd.png)