Add support for JSON-RPC batched calls #341
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This PR introduces proper support for JSON-RPC batched requests (http://www.jsonrpc.org/specification#batch)
In short, JSON-RPC raw requests from web3.js can come up in two forms:
{"jsonrpc": "2.0", "method": "subtract", "params": [42, 23], "id": 1}`[ {"jsonrpc": "2.0", "method": "sum", "params": [1,2,4], "id": "1"}, {"jsonrpc": "2.0", "method": "notify_hello", "params": [7]}, ]Each of the requests should be routed to proper destination RPC server (upstream or local).