* origin/serializable: (25 commits)
  Removed unnecessary SQLPanel.record_stats
  Updated replaceToolbarState to use request id.
  Move serializable changes into the main change log.
  Fixes #2073 -- Added DatabaseStore for persistent debug data storage. (#2121)
  Added check for pytest as test runner for IS_RUNNING_TESTS.
  Improve clarity of record_stats for serialization. (#1965)
  Hack: Sleep before checking to see if the history panel auto updated.
  Comment out the async button because it breaks the wsgi app.
  Fix tests for serializable changes with selenium.
  Avoid caching the config settings.
  Make template panel serializable.
  Rework the alerts panel to be compatible with serialization.
  Extend example app to have an async version.
  Update all panels to use data from get_stats on render
  Support serialization of FunctionCall
  Force everything to a string if it can't be serialized.
  Make Panel.panel_id a classmember.
  Support serializable sql panel
  Support serializable panels. This is a WIP and needs clean-up.
  Rename store_id variants to request_id
  ...