HTTP API issue 77,78,79 and 82,83,84,85

implement http api blockchain/with/certs and blockchain/with/actives

beceause just first block has certifications , so the result has just one element: 0 all test data don't have activities, so the response is empty I don't konw how to add test data

Closes #77 (closed) Closes #78 (closed) Closes #79 (closed) Closes #82 (closed) Closes #83 (closed) Closes #84 (closed) Closes #85 (closed)