[js_doc] replaced docco with jsdocs3
Merge branch 'jsdoc' into dev
[security_headers]

Upd: Module::Errors
--> Added #logDebug() for debug only logging
Upd: Module::Database
--> Renamed .api to .models
Upd: Module::Middleware
--> Implemented security headers as middleware for /app and /api
Upd: index.js (Main script)
--> Moved the process.NODE_ENV setup to the main script as first command to setup the environment as soon as possible
Upd: Module::Database
--> Added some code documentation
Merge branch 'security_headers' into dev