Changes

Batch requests for transaction receipts.
Make bigInt.toHex() format numbers as big-endian, with leading zeros trimmed.
Implement env.abort to improve logging of AssemblyScript exceptions.
Add GraphQL __typename support.
Optionally, write subgraph logs to Elasticsearch.
Add --ethereum-polling-interval / ETHEREUM_POLLING_INTERVAL option.
Bring the full test suite back (it had been partially disabled due to massive code changes).
Documentation improvements (getting started).
Fix casting bug when querying boolean entity fields.
Add BigInt math (+, -, *, / and %).
Add more data to Ethereum events, blocks and transactions passed to mappings.

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