2.8.7

 * Change urlNotFound.js to url-not-found.js (Rand McKinney)

 * Add lib/server-app.js (Rand McKinney)

 * package: add versioned sl-blip dependency (Ryan Graham)

 * fix User.settings.ttl can't be overridden in sub model (Clark Wang)

 * Fix Change.getCheckpointModel() giving new models each call (Farid Neshat)

 * Update README.md (Rand McKinney)
