* The installation script is now available.
   It automatically installs required softwares and configure the `droonga-http-server` as a system service.
   Currently it works only for Debian, Ubuntu, and CentOS 7.
 * The service works as a process belonging to a user `droonga-http-server` who is specific for the service.
   The configuration directory for the service is placed under the home directory of the user.
 * A static configuration file to define default parameters (`port` and so on) is now available.
   It must be placed into the configuration directory specified by the environment variable `DROONGA_BASE_DIR`.
   You don't have to run `droonga-http-server` command with many options, anymore.
 * A new command line utility `droonga-http-server-configure` is available.
   It generates the static configuration file for the service.
 * Cached responses are now returned correctly.