Prepare for testrpc@4.x.x

A list of steps from #63:

• publish an npm version of solidity-coverage with all the testrpc-sc deps pinned to commits instead of master so there’s a safe state.
• work out webpack / ganache-core in a dev branch
• validate against a few projects
• make testrpc 4.x new master (4.x is published from #coverage)
• write some dev instructions for us so we know how to update the webpack build
• npm publish testrpc-sc --> myrmi / cgewecke
• publish an npm version of soldity-coverage pinned to specific testrpc-sc version on npm

Other notes:

• check ethereumjs-vm dependency and upgrade
• don’t forget to integrate the gasLimit / default gas per transaction changes
• look into debug_traceTransaction (per area’s note in #52)

• Verified that ganache-core installs with ethereumjs-vm@2.0.2 and web3-provider-engine@8.1.19
• blockGasLimit = options.gasLimit || "0xfffffffffff"
• defaultTransactionGasLimit = '0xfffffff'

[area]

I believe it is a special case for major version 0, yeah, I’ll try and find an authoritative source for that when I’m out of this meeting 😛

[cgewecke]

Oooooh. I just watched Greenkeeper open a PR upgrading to latest at Gnosis and it passed. 🦉