houdini: altus, multiple hafarm nodes

added altus houdini node for hafarm; slurm is shifted to use rez instead of environs; added option to use multiple hafarm nodes in houdini output tree

v0.3.2

Merge pull request #24 from sergiy-nazarenko/master

merge nested branch

v0.3.1

job_name/scene_name from jinja2 template

version 0.3.0

Merge pull request #3 from sergiy-nazarenko/master

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