Add data objects for health code.
Add compound Redis key.
Use compound key for user sessions.
DynamoDB does not allow empty list of local indices; it has to be null.
Move EncryptorUtil to a new crypto package.
Move EncryptorUtil to a new crypto package.
Use random salt.
Merge pull request #77 from eric-wu/develop

Security update
Merge pull request #76 from alxdarksage/testinfra

Testinfra
Merge branch 'develop' of https://github.com/Sage-Bionetworks/BridgePF into fixes