move wellKnownJson to domains

after some more thought:
* If app moves to another location, user has to remember to move all this config
* It's not really associated with an app. It's to do with the domain info
* We can put some hints in the UI if app is missing.

part of #703

src/test/volumes-test.js

@@ -66,6 +66,7 @@ describe('Volumes', function () {
 
     it('cannot add duplicate name', function (done) {
         volumes.add('music', '/media/music', AUDIT_SOURCE, function (error) {
+            console.dir(error);
             expect(error.reason).to.be(BoxError.ALREADY_EXISTS);
             done();
         });
@@ -110,4 +111,4 @@ describe('Volumes', function () {
             done();
         });
     });
-});
+});