Subtle bug in parameter handling

The parameter names must not be converted to upper case before calling
context.invoke, because that works with the lowercase names.

Before this bugfix,, we had kw like this in the various setup_* functions:
{'DB_URI': 'sqlite:////tmp/wiki.db', 'db_uri': 'sqlite:////real/path.db'}
and whichever won was pretty much random (dict sort order)

realms/commands.py

@@ -61,7 +61,7 @@ def prompt_and_invoke(ctx, fn):
     for p in fn.params:
         v = click.prompt(p.prompt, p.default, p.hide_input,
                          p.confirmation_prompt, p.type)
-        kw[p.name.upper()] = v
+        kw[p.name] = v
 
     ctx.invoke(fn, **kw)