make installation similar to Ethereum CLI #139
Description
Make installation more like https://ethereum.org/cli (as per https://runtimeverification.slack.com/archives/C7XCM16UE/p1529699939000439).
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Make installation more like https://ethereum.org/cli (as per https://runtimeverification.slack.com/archives/C7XCM16UE/p1529699939000439).