Feature/batch payments

[maxceem]

Release Guide

• run migration npm run migrate
• reindex RB, WP, WPP by npm run index:resource-bookings

[maxceem]

Final Fixes:

1. Resolve merge conflicts (I guess we can use data/demo-data.json from dev branch).

[maxceem]

@xxcxy would you like to merge dev branch into feature/batch-payments and resolve merge conflicts. Payment $40.

• data/demo-data.json use file from dev as a base, but you may update for changed done feature/batch-payments if necessary
• docs/Topcoder-bookings-api.postman_collection.json - here is we need to use version from dev as a base, and apply the same changes as you did in the challenge
• src/bootstrap.js - trivial