Added a description and more importantly a data type.

The description is optional but the type field is not. The php json
validator technically requires it in order to check work at all.
Links to specs and changelog added in the result boxes and no longer using hard-coded urls.
Integrated the validator with the router.

The validator route is called as follows:

  http://openspace.slopjong.de/validate/syn2cat
  http://openspace.slopjong.de/validate/?url=http://www.hackerspace.lu/od/

Wrong URL or space name lead to a defined error message (encoded as a json).
Phone field removed which was left from copy&paste. New draft changes.

  * The meaning of the status field has changed, it's now a compound
    object of all the fields that are related to the space status
  * Moved the fields open, lastchange and icon to status/{open,lastchange,icon}
  * Added the message field which was the former status field
  * Made the status icons non-required, because there's no app that
    is really using them and furthermore some spaces use them incorrectly
    because they (haven't|don't want) such icons.
  * Moved address to location/address