Release 0.3.10

This release includes:

• dsub
  • Update Makefile to use Python3 venv
  • Add documentation around Compute Engine Quotas.
  • Have dsub output job-name and user-id in addition to job-id prior to launching job.
  • Fix for --users '*'
  • Update httplib2 for dsub to 0.18.1
  • Retry transient http error codes when checking GCS
  • Fix for yaml 5.3 where timestamps are already loaded as timezone aware.
  • Improve performance of GCS output file checks for --skip