Finished refactoring finance object.

Refactored finance object.
 * changed all properties to private.
 * added new setters & getters.
 * changed names of some variables, so that they make more sense.
 * created a  calculate total value  method.

 Removed some unnecessary libraries.
Finished refactoring finance object.

Refactored finance object.
 * changed all properties to private.
 * added new setters & getters.
 * changed names of some variables, so that they make more sense.
 * created a  calculate total value  method.

 Removed some unnecessary libraries.
Merge remote-tracking branch 'origin/master'