feat(lib/logging): A winston wrapper that saves module context
chore(logging): using kernel-logger in index and config-builder
feat(logging): core logger plugin
fix(models/User): remove pre-save message sanitization

Because it was removed from validator library and because alterng user
data before saving is not a good idea, sanitization should be performed
by presentation layer
fix(model/Group): remove pre-save sanitization
Merge branch 'master' of github.com:mykabam/kabam-kernel