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)

lib/bma/blockchain/with/actives.ex

 defmodule BMA.Blockchain.With.Actives do
     def get do
-        Poison.encode!("#TODO")
+        {:ok, :block} = :dets.open_file(:block, [{:file, 'data/block'}, {:type, :set}])
+        result = []
+        result = result ++ :dets.traverse(
+            :block,
+            fn {_, value} ->
+              if(length(value["actives"]) > 0) do
+                  {:continue, value["number"]}
+              else
+                  :continue
+              end
+            end
+                 )
+        JSON.encode!([result: [blocks: result]])
     end
 end
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