Show amount in cents format: BTC -> sats

[stebo]

I registered BTC in money.rb like shown here #710

Now it would be great to sometime show money values in Satoshis instead of BTC or additionaly, e.g. if a user has a very low balance: 0,00000500 BTC -> 500 sats

I could not find anything in Money::Formatter that would allow showing a currency in cents value / with cents symbol... any way to do this or hints how to accomplish that?