typo
run_command() rename + cleaning

I renamed the function run_command() to render_chunk().
It can always be renamed later if needed
It can now get 3 arguments from the server : start, end, and
blendfile-path
I think it is the basic stuff we need for the moment.
Merge branch 'master' of https://github.com/fsiddi/brender

# By Olivier Amrein
# Via Olivier Amrein
* 'master' of https://github.com/fsiddi/brender:
  run_command() rename + cleaning
  typo