ethereum / web3.js / 2037

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if multiple events, return array (#1048)

* return array of events if multiple

This fixes a bug where if a transaction emitted multiple of the same
events, the transactionReceipt only returned 1 of them.

We now return an object for the event if there is only 1. If there are
multple of the same events, then we return an array of event objects

* update docs and create new test

* remove spacing changes

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