active_shipping Re-authenticate with stamps api on two additional faults.

According to the Stamps API documentation re-authenticating is also a potential fix for 'Conversation Out-Of-Sync' and 'Invalid Conversation Token' faults.

Ref: http://developer.stamps.com/assets/documents/developer/downloads/Stamps.com_SWSIM_Reference_v42.pdf

Note: This is just bringing back #312, but with CI passing. CI was failing on #312 due to bad luck... @kvanwagenen forked the project while it was broken ( 9ac1bb4 fixed the remote test failure)

PR #545 was recently closed by @maartenvg, and I assume that was because PR #545 wasn't a simple 1-commit merge against master. So I have re-based the changes against master, and re-submitted.

Nov 10 '17 14:11 rdunlop

I had to make a change to master that made GitHub automatically close your (and a few other) PR. It was not intentional close, nor in response to its content. Sorry for the inconvenience.

Nov 10 '17 15:11 maartenvg

Thanks @maartenvg I will try to monitor this project, and re-base my PR once the develop CI failure is fixed...in hopes that then this PR will be merge-able.

Nov 10 '17 15:11 rdunlop