[Feature Request]Ability to accept other crypto currencies besides Bitcoin

[Feature Request]Ability to accept other crypto currencies besides Bitcoin: With crypto currencies becoming more and more prevalent as a preferred way to do business, I think it would be a great enhancement to Invoice Ninja if it supported other crypto currencies besides Bitcoin. The folks over at CoinPayments make this possible. They support almost 60 coins with more coming online and provide the necessary apis for integration. Take a look at their service, I am sure many others in the Invoice Ninja community would like this. Please note that I am in no way affiliated with CoinPayments, I only...