Add Squid Verification and Distance vs Load Optimization #63

The shoalUpdate thread systematically runs the verification test on squids saved to the server.
The verification test its contained in the squid_auditor.py file.
Html templates changed to accomidate the verification column in the web interface.

Special Verification Cases
Some squids cannot be authenticated from outside their domain.
Changes made to agent and server to accomidate these special cases.

Add new url '/allnearest'
/allnearest returns all squids regaurdless of their verification status.