Implement Simple Event polling and create profile based testing

[The-Huginn]

• Implement simple Event polling processor, which adjust the received events and fires those events
• Implement simple testing framework for manual event firing - i.e. GitHubEventEmitter - new interface for firing events, our event polling processor)
• Implement another testing framework for profile aware testing, between sse and manually fired events from polling
• Rewrite tests to use profile aware testing

Future work:

• Tests for event firing testing framework
• Implement caching of events since last polling (currently we take only the last event and fire it) + tests