Feature for converting currencies

[josemaia]

!eur 60 usd - converts 60 usd to euros, and returns the price

!eur usd - displays the conversion rate between eur and usd

Suggested API: fixer.io (i.e. HTTP GET TO https://api.fixer.io/latest?symbols=EUR,USD)

[eSoares]

Would be better a more independent of currency command.
Maybe:
!money <quantity> <origin> <destination>
?