Implemented Linear fee.
Added javadoc to FeeStrategy interface.
Added wraps() and toString() methods.
Completed CrossedStepException.
Added collides() method, documented wraps() and collides().
Implemented ScaledPercentFee.
Refactored fees to its own package
Documented fee attributes.
Fixed a typo on Investment* class names.
Added prototype tests for fees.
Renamed Investiment*
Removed pointless exception test.
Added default constructor.
Added add, remove and clear methods.
Now getTransactions() returns a copy of the collection.
Merge branch 'master' of github.com:ULE-Bank/control-integration
Added @param doc.
He añadido el handler de las acciones
Corrected Handler import, added amount attribute, created missing setters and getters,
Implemented BagSimulator.