Cleans up internals

- moves application boot sequence code into application package
- removes internal log package dependencies
- fixes up the dependency graph for UAA client
- removes config package dependency from requests package
- moves config.Environment into application package
- moves requests package to web/services
- removes direct dependency on web/services from web/handlers
- cleans up basic authenticator
- merges web/server and web/router
- uses viron to parse environment variables
- updates stack dependency to latest