Add Denarius (D) currency

[metaspartan]

Adds back Denarius (D) Support to HyperDEX

PR for Cryptocurrency Icons to update namings from DNR to D:
spothq/cryptocurrency-icons#295

PR for jl777 coins repo, already merged:
jl777/coins#276

[sindresorhus]

DNR electrums were run by the coin owner, but not maintained, so they were causing problems
- #577 (comment)

What guarantees do we have that this won't happen again?

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Please also read and adhere to https://github.com/atomiclabs/hyperdex/blob/master/docs/add-currency.md (Read it thoroughly)

[metaspartan]

DNR electrums were run by the coin owner, but not maintained, so they were causing problems

• #577 (comment)

What guarantees do we have that this won't happen again?

Please also read and adhere to https://github.com/atomiclabs/hyperdex/blob/master/docs/add-currency.md (Read it thoroughly)

Two of the electrums are ran by a team mate now and I am running the third, they are hosted on a better platform now as well for all of them. We want Denarius on the HyperDEX, there was communication issues before due to you guys moving from Slack and myself leaving due to the Slack exploits. We are all on Discord now for easier communication.

[buzzkillb]

I will be running some of the servers, so its not just falling on carsen this time. They will be kept up.

[lukechilds]

This looks good to me.

@sindresorhus is there anything you spot missing from https://github.com/atomiclabs/hyperdex/blob/master/docs/add-currency.md ?

[sindresorhus]

The servers should available on **domains/subdomains, not IP addresses. **

[sindresorhus]

The title of the pull request should be Add Name (SYMBOL) currency. For example, Add FooCoin (FOO) currency.

[lukechilds]

@carsenk @buzzkillb whichever of you runs 51.158.98.28 can you put a domain in front of it?

Should help reduce downtime in the event that you need to change servers or for some other reason lose access to that IP.

[metaspartan]

@lukechilds

I pointed denariuspool.info and electrum.denariuspool.info to 51.158.98.28

It will take awhile for DNS propogation

[metaspartan]

Also denarius.vip and electrum.denarius.vip will be pointed to 51.158.98.28 and eventually a forth server