Allow Parity as ingest node (#36)

* Upgrade go-ethereum to v1.8

* Add Node Info for parity nodes

* Upgrade start_private_blockchain to use v1.8

db/migrations/1520289493_update_eth18_types.down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE blocks
+  ALTER COLUMN size TYPE BIGINT USING size::BIGINT;

db/migrations/1520289493_update_eth18_types.up.sql

@@ -0,0 +1,2 @@
+ALTER TABLE blocks
+  ALTER COLUMN size TYPE VARCHAR USING size::VARCHAR;