Only make TestUtils available if mockatoo and utest are used.
Don't use EasyAuth on the client...
Switch to thx.core

Stop bundling the old version of thx.

This is a big change, apologies if it breaks code dependant on old thx.

Thanks to @fponticelli for the newer, cleaner and maintained lib!

The unit tests we have are passing, the docs are compiling, and our hello world works.
Phew!
1.0.0-rc.10