Add BridgeConfig and the related types, resources.
Move to the config package.
Add unit test to BridgeConfig.
Merge pull request #21 from alxdarksage/develop

Updates to health data API
Add fixed salt.
Merge pull request #22 from eric-wu/develop

Add BridgeConfig
Health data service tests.
Merge branch 'develop' of https://github.com/Sage-Bionetworks/BridgePF into develop
cleanup