yaml config file option added
changed -c option to point to YAML file; read certificates from file; same processing for YAML and Redis; updated README
adding feature to track external message IDs
fixing typo
moving ext id to Core
Merge pull request #3 from tilo/feature/tracking-external-ids

adding feature to track external message IDs
Merge pull request #2 from tilo/feature/yaml-change-config-option

Unified Processing for YAML/Redis; -c option points to YAML file; read certificates from files
fixed indentation and syntax error
Merge pull request #6 from tilo/internal-release

config in YAML file; tracking external IDs