Proposed changes for multi-testnet faucet option

[cooganb]

Hey there, two main changes:

• The first is on the webapp side, where it's mainly about providing a valid etherscan URL that's not just ropsten
• The second is proposed changes on server file, showing where I think the indicated network will be.

I'm not familiar enough with the codebase or ethQuery to make the best decision about this, but will message you on slack as well.

The other thing I'm stuck on is the best way to encode which network the user wants when sending the POST request -- it could either be stuck onto the front of the rawdata string that's parsed, or the webapp can format the req into a JSON. but I think parsing a JSON on the server side might be a little too weird, but you would know best.

[kumavis]

you should also checkout https://github.com/MetaMask/test-dapp/ and see if it meets your needs

[kumavis]

also going to need infura api keys for each network