v1.5.0 back end upgrades

Merging:

• Re-write back end database server
• Refactor dockerfile into smaller docker services:
  • Python build / test
  • database server
  • webserver
  • docs server
  • AIS receiver server
  • TODO: AIS receiver client
• Update SQL schemas
• Add postgres support
• Patch fixes
  • Receiver server logging
  • Gateway router config