Feature Request: add "page" argument to "projects" and "clients" queries

I would suggest adding support for the “page=N” argument to the “/projects” or “/clients” API queries (rather than returning all projects or clients).

Currently, the “/invoices” API query supports a “page=N” argument, however this does not seem to be also supported for the “/projects” or “/clients” queries. This creates a scaling problem when there are lots of clients and/or projects.

In terms of supporting the existing behavior, I would make the default value of “page=0” and give this (0) the meaning of “all pages”. If page > 0, then it would only return 50 items at a time.

Note: it might also be nice to be able to set a “page-size=50” argument to override the default page size.