Upgrade of web3, bugs in deployContract, UI Fixes, Refactoring

[vbaranov]

Change log:

1. Migration from [email protected] to [email protected] (web3.toWei -> web3.utils.toWei, web3.fromWei -> web3.utils.fromWei, web3.isAddress -> web3.utils.isAddress, contract deployment, call of contract methods, sending of tx to contract, web3.eth.accounts -> web3.eth.getAccounts())
2. Callback is fixed for deployContract function in stepFour\utils (doubled callback fix)
3. Depreciated code is removed
4. Twitter link is fixed in footer

Joined issue: #232
Possible joined issue: #206

Affected 3 end-users at least

[igorbarinov]

I tested it on Stage server and had one issue with an exception in a contract and warning from metamask?

I recorded a video with my test, it's in the fifth minute.
https://youtu.be/N5mwzEiD7Tw?t=5m

[mark-antony1]

How urgent is this? I would like to minimize the updates to code that touches 'state' until the new state management system is here.

[vbaranov]

Fixes from this PR may affect end-users on production to solve their problems. IMHO, it is urgent.

[igorbarinov]

I agree, let's merge it 💯

[igorbarinov]

I tested on production and was successfully created an instance on Kovan. I think we should approve it and merge ASAP

[mark-antony1]

Please address this comment prior to merging. I approve this, but will need help merging this commit with the new state management system. Much of this commit is unclear to me.

[vbaranov]

@15chrjef Thanks. I'll help you with manual merging for your PRs.