ngapp: remove duplicated content from changes.html
Gruntfile: `grunt serve` listens on 3000

Change the dev server's port to 3000 to make it consistent with the
setting used by `node .`
ngapp: fix conflict view

- Add missing table header for the change type

- Handle "create" in the same way as "update". This kind of conflicts
  occurs after the restart of the server when in-memory datastore
  is used.