Add option to retrieve Bitfinex account history

[BeastOfBodmin]

Maybe this detracts from the core idea of this app, but it would be useful to be able to pull the various acount reports from Bitfinex from within this app. It would be one more reason not to have to log in to the Bitfinex web site.

[JulyIghor]

Ideology of app to create single experience with different exchanges, so it should works the same way as on others.