Release V2.7.0

[anthonysena]

Release Version V2.7.0

• Use latest master as candidate V2.7.0 of Atlas & WebAPI and deploy to development. Ensure that all pom.xml references are using released libraries per Ensure only non-snapsot references are in POM.xml on master #626.
• Complete testing and obtain sign off, specifically Deadlock issue when generating CC and retrieving cohort characterization analysis list #700
• Generate WebAPI Release Notes
• Update source code formatting? Per Code Formatting - For Discussion Only Atlas#1213, only aim to do the formatting and not linting for ATLAS.
• Publish Release
• Update wikis to reflect any install/setup instructions
• Update OHDSI.org
• Communicate release via OHDSI forums