Fixed model list UI regression, #170

Fixes #170

The UI now looks like before the regression and still works.

Note that it now require javascript to function properly, not sure if this is a problem? This is because bootstrap uses links in dropdowns and the form has to be submitted with a POST. 

If we want to support non js users we could keep the current select + button and replace it with the bootstrap dropdown in javascript. The downside is that we then would have to maintain two versions of the same UI.