Git ignores .swp files
Add auditing to project model
Added audit log to models for instutites, machines, people and projects
Change ForeignKey(to=...) to use strings rather than direct references.
Update requirements.txt to latest, especially for django-pipeline.
Merge branch 'feature-update-requirements' into develop
Revert premature commit of django-audit-log model changes.
Revert premature audit-log requirements/setting changes.
Sync feature-continuous-integration with develop.