Making several improvements.
- locking in salt version to 2014.1.13.
- Saving copy of stderr and stdout to a file for each
  SoftwareConfig. Should make debugging easier. Logs will be saved
  in /var/log/heat-deployments/.
- adding set -ex to each software config.
- Removed trailing whitespaces.
Merge pull request #9 from absalon-james/master

Making several improvements.