replace Web3() by Web3(provider)

[fireblockdev]

The Web3() syntax is not valid anymore for the web3js project owner. To upgrade web3js to a recent version (> beta 37), it is an operation needed. However, this is not sufficient.

Other changes:

• Web3.utils.toWei to Web3Utils.toWei (with the package web3-utils)
• Web3.utils.BN to Web3Utils.BN
• remove web3-providers-ws and replace by Web3.providers.WebsocketProvider

But after these changes, many unit tests doesn't work anymore

[ellis2323]

With the new version web3js 1.0.52, it seems that we need to provide these options:

new Web3(provider, null, { transactionConfirmationBlocks: 1, transactionBlockTimeout: 5 });

[davidmurdoch]

Thanks for the PR, @ellis2323. Since the next stable version of web3 will be 1.0.0-beta.37, and in the near future we'll be removing nearly all web3-dependent tests from our codebase, I'm going to go ahead and close this.