Avoid unnecessary PUT requests

CR generates a PUT request whenever an app starts up, if the app defines a view. This creates work for the database (and possibly, monitoring programs) which is avoidable in many cases.

It would be better for CR to GET the view first. If the old view exists and is the same as the new view (the common case), CR could avoid doing the PUT request.

In my own (admittedly odd) application, there is another reason to want this behavior. I am writing a proxy that will prevent all requests (eg, PUT, DELETE) that could modify the database. CR's current behavior makes this impossible, short of monkey-patching.