Selecting and then deselecting environments breaks project save

[dave-shawley]

I created a new project, selected a few environments, and then deselected the environments before pressing save. The save dialog never closed:

[dave-shawley]

I dug into this a little and localState.urls is not being maintained properly in views/Project/Create/Create.jsx. Adding an environment causes the URL to be appended but removing an environment does not remove the URL. This leads to a case like the following after all of the environments have been deselected (removed):