Update dependencies
Update dependencies

- Use web3 v0.20.1
- Unilaterally switch all internal deps to ^ selector
- Use truffle-artifactor v2.1.5
- Use truffle-compile v2.0.4
- Use truffle-config v1.0.1
- Use truffle-contract v2.0.3
- Use truffle-deployer v1.0.2
- Use truffle-init v1.0.7
- Use truffle-migrate v1.1.5
- Use truffle-provider v0.0.3
- Use truffle-require v1.0.4
- Use truffle-solidity-utils v1.0.1

ConsenSys/truffle