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/blocks.ex

 defmodule BMA.Blockchain.Blocks do
-    def get(count,from) do
-        Poison.encode!("#TODO")
+    def get(count_string,from_string) do
+        {count, _} = :string.to_integer(count_string)
+        {from, _} = :string.to_integer(from_string)
+        {:ok, :block} = :dets.open_file(:block, [{:file, 'data/block'}, {:type, :set}])
+        result = Enum.map(from..from+count - 1,fn n ->
+            case :dets.lookup(:block, n) do
+                [] -> nil
+                [{n, block}] -> block
+            end
+        end)
+        case hd(result) do
+            nil -> {:ko,JSON.encode!([])}
+            _ -> {:ok,JSON.encode!([blocks: result])}
+        end
     end
 end
\ No newline at end of file