Fix truffle-contacts dependencies

[maksim-tolo]

• Add missed ethers and truffle-compile dependencies
• Remove unused ethereumjs-util, ethjs-abi, lodash and require-nocache dependencies
• Move uglify-es to devDependencies
• Replace web3.utils with web3-utils
• Replace ethers.utils.bigNumberify with require('ethers/utils/bignumber').bigNumberify

Production bundle size has been reduced by more than 264 KB (≈12%).

[coveralls]

Coverage decreased (-0.006%) to 69.894% when pulling 60dee61 on maksim-tolo:truffle-contract-dependencies-fix into d15834b on trufflesuite:develop.

[gnidan]

Thanks for this! Nice job digging and sorting all this out!