Release 0.8.2.0 2017-12-04

[Wally73]

0.8.2.0 2017-12-04
Added:
   * settings.example.php has new constants for a maintenance mode. If the mode is set to true
    then the API/web site return a status of 503 with the message "Maintenance Mode". The page
    returned by the server should be defined with the MAINTENANCE_MODE_HTML_PATH constant.
       
         **NOTE** This requires that you update your settings.php file. There are two things
         to change.
         1) the version number from 4 to 5. Near the top of the file.
         2) The addition of the maintenance mode constants near the bottom of the file. This
           is optional, but it is wise to add them.

Changed:
   * Removed the logged in user check, during API key checking. This prevents incorrect keys from
   being used.

Fixed:
   * Corrected status code for "Missing parameter (apikey)" redirect.
   * Made username check be case-sensitive, as they should *always* be.
   * Not found exception some users were experiencing.