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Fix unreliable array test in Contract package (#1013)

Using node.js 6.11.2 I get the following error when trying to instantiate contracts:
> jsonInterface instanceof Array
true
> new web3.eth.Contract(jsonInterface)
Error: You must provide the json interface of the contract when instatiating a contract object.

Although jsonInterface instanceof Array evaluates to true, the exact same test condition evaluates to false within the Contract constructor with the passed down json interface. Using either "Array.isArray(jsonInterface)" or "toString.call(jsonInterface) === '[object Array]'" as a test condition instead fixes the issue.

Also the typo in the error message got corrected.

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