Make refresh rate configurable in CLI

[aodhan-domhnaill]

couch2pg/env.js

Line 47 in 871d4c9

sleepMs: 10 * 60 * 60 * 1000,

It would be useful to be able to configure the rate that couch2pg refreshes so that local development can refresh faster.

[garethbowen]

Agreed! Feel free to submit a PR for this with documentation. I propose we release it but don't worry about updating any prod instances as they won't be setting it anyway.