Debug page

[jsyrjala]

Add debug page to ui.

• "secret" url, not part of navigation? easy to disable
• displays incoming event traffic
  • full JSON message
  • arrival timestamps
  • link locations to map (see Bookmarkable permalinks to map page #5)
  • arrival channel (WebSocket, REST api)
  • timestamp when server was last queried
  • results per tracker

[SeppoTakalo]

I was thinking more like:

• Display last message parsed,
• Updates real time.

For example:

event: 2013-05-06T08:09:00Z
session_code:
annotation:
lat: 65.05050502
lon: 25.5321987
satellite_count:
...

All fields from event(if possible, if not, then all know fields from database)
Fields should be in same order every time, so it is easy to watch if it changes quickly.