rate limit retry handling

Added 503/429 retry handling when Rate-Limit header is present.

Including import

1.0.3

Added back in the import function from 2014.

v1.0.2

Updated to include visibility in help sections

I hate composer

v1.0.1

Provisional updates for start of support for HelpDesk area.

Ready to use on Prod

1.0.0-RC

Making Attachments work (The Zendesk API does not take HTTP POST'ed f…

Release

1.0.0

fixups