v2.4.0

lib,tests,deps: fix role related tests, debug, opt

- Fixed various tests related to Roles
- Added DEBUG property, defaults to false
- Added longStackTraces=false configuration for browsers, this will yeild
  a huge performance increase
- Updated dependencies
  - Bluebird 3.3.1 -> 3.3.4
  - Lodash.merge 4.2.0 -> 4.3.4