WIP
Basic chimera working.

* chimera -vv is working as expected, lifecycle handled using zygote.
* event handling working, see docs/examples/script.py.

many bugs yet, but improving.
CLI working.

* Added basic exception support. Still insufficient, but improving.
* chimera-tel working
* chimera-cam --info working
Remove etree. Python have it now
WIP
Update requirements.txt
Add futures requirement
WIP
WIP 2
WIP 3