Get_command now uses Chunkypath, scene and target in commands.
Added more tests for get_command.
Added tests for quality target in get_command.
Added harness for mocking.
Added mock testcase for main and get_commands
Added testcase for missing Chunky path for render_all.
Added run_command to render_all.py
Fixed typo in render_all_test.py
Added testcase for render_all.py