(Feature) Add warning and pause deployment if user accidentally change MetaMask account while deployment

[dennis00010011b]

Inspired by https://poanetwork.slack.com/archives/G8HRTP6JZ/p1519910256000437

Problem:

if user accidentally change the metamask account while deployment the deployment continues, option "skip transaction" is available for next 3-4 transaction and deployment freezes even if user returns back to right account.

Possible solution:

1. Should be warning : "Not owner. Unable to continue ..........etc."
2. Deployment should be paused until user switches to right Metamask account.

If you are reporting a problem with Token Wizard, please include the following information:

Which network did you use? (Mainnet, Kovan, Rinkeby, etc.)

Rinkeby

If you were able to create it, what is the URL of your crowdsale?

https://wizard.poa.network/invest?addr=0x719c2571Af05B64a8c8f17E69c7720BC727368AD&networkID=4

Do you have screenshots showing the problem?

https://drive.google.com/open?id=1NNIZsGv3hZMzmXRIk9tdg_90zBErkpjs

Do you see errors in the dev console? If yes, please include a screenshot

To open the dev console in Google Chrome, press F12, or go to View -> Developer -> Developer Tools, and open the Console tab

If you see errors, please right click on them and "Save as..". Zip saved file and attach it to the Issue.

No

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[fvictorio]

This issue and #593 may be related. The problem is not the same, but the solution is similar (handling metamask events). See my comment there for a possible approach