Ipython-cluster-helper

- Fix for SLURM engine output files not having the proper job IDs.
- Additional fixes for python3 support.

- Additional work to better resolve local IP addresses, first trying to pick
an IP from the fully qualified domain name if available. Thanks to Linh Vu.
- Support PBSPro systems without select statement enabled. Thanks to Roman Valls
Guimerà.
- Enable python3 support for Slurm. Thanks to Vlad Saveliev.
- Enable support for ipython 5.

- Try to better resolve multiple local addresses for controllers. Prioritize
earlier addresses (eth0) over later (eth1) if all are valid. Thanks to Luca Beltrame.
- Provide separate logging of SLURM engine job arrays. Thanks to Oliver Hofmann.
- Set minimum PBSPro controller memory usage to 1GB. Thanks to Guus van Dalum
vandalum.

- Ensure /bin/sh used for Torque/PBSPro submissions to prevent overwriting
environment from bashrc. Pass LD_* exports, which are also filtered by Torque.
Thanks to Andrey Tovchigrechko.
- Add option to run controller locally. Thanks to Brent Pederson (brentp) and
Sven-Eric Schelhorn (schelhorn).
- Fix for Python 3 compatibility in setup.py. Thanks to Amar Chaudhari
(Amar-Chaudhari).

- Emit warning message instead of failing when we try to shut down a cluster and
it is already shut down. Thanks to Gabriel F. Berriz (gberriz) for raising
the issue.
- Python 2/3 compatibility. Thanks to Alain Péteut (peteut) and Matt De Both
(mdeboth).
- Pass LD_PRELOAD to bcbio SGE worker jobs to enable compatibility with
PetaGene.

- Pin requirements to use IPython < 5.0 until we migrate to new release.
- Fix passing optional resources to PBSPro. Thanks to Endre Sebestyén.
- Spin up individual engines instead of job arrays for PBSPro clusters. Thanks to
Thanks to Endre Sebestyen (razZ0r), Francesco Ferrari and Tiziana Castrignanò
for raising the issue, providing an account with access to PBSPro on the Cineca
cluster and testing that the fix works.
- Remove sleep command to stagger engine startups in SGE which breaks if bc
command not present. Thanks to Juan Caballero.