[*] Add cloud specs to node scripts
[*] Add cloud specs to node scripts

Summary:
Implements `test-cloud` to cd into each cloud package and run `npm test`.
It's easier this way because of the relative paths in the Jasmine configs,
and this also ensures that the tests can always be run within their
individual packages too.

Also calls `test-cloud` from `test` so people don't forget about it. If
someone wants to test just the client, they can explicitly do so with
the `test-client` script.

Depends on D4058, D4059, D4061, and D4062

Test Plan: Ran the tests

Reviewers: evan, mark, juan

Reviewed By: juan

Differential Revision: https://phab.nylas.com/D4031

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