Update the "Use In Production" examples

[sondreb]

There are only 3 production use examples, and only one of them is actually a functional production service as of 2017-12-15.

Coinbolt website never responds, probably service is gone?
Helloblock reports "Helloblock API will be turned off by 1st of April, 2015."
Bitrated appears to be functional and working.

Would improve credibility to update the list, showing good examples on library usage.