Merge pull request #49 from whauwiller/master

Added Try Catch for the alembic exporter
Merge pull request #50 from whauwiller/master

Fixing bug in alembic exporter
fixed alembic export error
Merge remote branch 'upstream/master'
nathan's fix for locked references
set version function for rendering works
lighting render shelf tool
Pulling Alembic Range from the animation range
Merge remote branch 'upstream/master'