Huge rework of the php part & new features. The introduced design provides a much better maintainability.

  * A routing controller has been created which handles all the requests and actions.
  * Cron rotator, if a space api cannot be cached it's rescheduled to a bigger interval.
  * Directory removal, if a space api cannot be cached it's removed from the public
    directory and added again as soon as the space server is back online.
  * Every cache update is reported to a file while a fail counter is incremented when
    a space server is not reachable. Every 23-24 hours a report email will be sent to the
    space and the OpenSpaceLint admins.
  * It's easier now to define a proxy for a space that hasn't implemented the Space API
    but has a status flag on a blog, in a wiki or somewhere else. Essentially it's just
    about writing a static json, leaving out the open field and defining a url and a pattern
    to get the space status. It's automatically merged with the static json.
  * Other things that have been improved are the directory structure, the configuration
    file and the setup scripts.