upgrade to dapple 0.8 / solidity 0.4

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Fixes #57, #55.

TODO:

• add solidity version pragma "pragma solidity ^0.4.2;"
• fix test contract deployment failures (throw on deploy) [pending ethereumjs-vm update]
• rebase and update ci

The latter appears to be dapple / solidity issue, probably exposed by the largish setUp method in the auction tests (which creates several new contracts).

The global setUp method could be replaced by some use of dapple script - this would set the initial chain state from which each unit test would fork from.

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@mhhf: I still can't work out these deployment failures. There seems to be some relation to test contract size, but it isn't at all direct.

Some data points:

• I split up the AuctionManagerTest (which was failing to deploy) and then found that there were more deployment failures in unchanged contracts that didn't fail to deploy before.
• ForwardSplittingTest: dapple test -r forwardsplittingtest fails to deploy, dapple test is ok
• ClaimTest: dapple test -r claimtest deploys and passes, dapple test fails to deploy
• BidTest: dapple test -r bidtest fails to deploy, dapple test fails to deploy
• ReverseGasTest: dapple test -r reversegastest deploys and passes, dapple test fails to deploy

It feels like a race condition, but ¯_(ツ)_/¯

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@mhhf: ethereumjs/ethereumjs-monorepo#91 fixes the deployment failures :D

[mhhf]

Awesome :D
Once it get merged into etherumjs-vm i'll build it into dapple immediately!