Update example config file from json to new protobuf format.

Change-Id: I38646c2be53b6993abe464d9cdd9b211678de496
More updates for first time users.

    - Modified sample conf so it is useable by default, also added some
      comments from the 'hello world' configuration.
    - Updated README so there's a clear two step start for newbies.
    - Added extra vim swap files to gitignore.

Change-Id: I76203973db4a7b332014662fcfb2ce5e7d137bd8
Merge changes I76203973,I38646c2b

* changes:
  More updates for first time users.
  Update example config file from json to new protobuf format.