- added hook support (executed after parsing config but before starting
engine)
- renamed TestEnvironment.Setup -> TestEngine.Run as it represents the
setup for a single cgr-engine instance
- replaced t.Log with t.Error for engine process kill error
- improved option comments
- added support for dynamic configuration for dbs
- ConfigJSON field can now be used to partially overwrite an existing
configuration
- extra cgr-engine flags can now be passed to the Run method
- added default db configs for mongo/internal
- implemented helper to load using cgr-loader