I developed this for #820 to provide the correct cache behavior when a service wants to use custom parameters from the query string.
For safety, only the declared parameters (and the global parameters) are provided to the service. Consequently, failure to declare a parameter results in the parameter not working at all (undesirable, but easy to debug) rather than indeterminate behavior that depends on the cache state (undesirable, but hard to debug).
- Add tests to request-handler to prepare for some tweaks to caching for #820
- Clean up code in request-handler: renames, DRY, arrows, imports
- Allow for clean shutdown of `setInterval` code. This requires the ability to cancel autosaving.
- Upgrade to Mocha 4, and clean up so the process exits on its own (see mochajs/mocha#3044)
- Better encapsulate analytics
