(cikl/cikl#26) Refactor event

- Remove unused fields
- Rename malware_md5,malware_sha1 -> md5,sha1
- Add sha256, sha512
(cikl/cikl#26) Remove 'group' from event
Rename AddressRole -> Observable
Renamed "Address" to "Observables"
Rename testclass
Drop 'address' for 'observables'
Merge pull request #7 from justfalter/refactor_event

Refactor event