Keep sessions for a week

Dependencies

• [2] E3M46H7T Keep session state across hydra-server restarts
• [3] HSVVEKTY * Start of a JSON API to get information about a specific build.
• [4] VBUNNYXG Fix path to the session data
• [5] PCKLFRT5 Support push notification of repository changes
• [*] J5UVLXOK * Start of a basic Catalyst web interface.

Change contents

• replacement in src/lib/Hydra.pm at line 56
  [3.615]→[3.615:649](∅→∅)
  − expires => 3600 * 24 * 2,
  [3.615]

  [2.0]
  + expires => 3600 * 24 * 7,