Revert nodes entry for job in job class from a list back to string. Modified cpus_allocated in job class to handle a node string and not a node list (Issue#41).
Check nodes string before attempting to split for decoding cpus_allocated
Updated to support Slurm 14.11.2
Merge branch 'slurm-14.11'

Conflicts:
	pyslurm/pyslurm.pyx