Tested all the possible exceptions.
Added exception test.
Added exception test for ScaledPercentFee.
Added test/es/unileon/ulebank/pack
Renamed package
Added InvestmentFundPackTest
Transaction now imports the correct Handler.
Removed final qualifier from packs and added sell() method to StockPack.
Created buy* methods,
Created buy* methods and fixed some minor warnings,
Merge branch 'master' of https://github.com/ULE-Bank/brokerage
Added missing qualifier abstract to class Buyable.
Removed unnecessary test for abstract class (sorry).
Merge branch 'master' of github.com:ULE-Bank/control-integration