Changed application icon
Renamed packages
Created bill class
Variables added into bill class
Getters and setters added into Bill class
Created BillController class
Created some new methods.
Created a new Bill constructor
Made some changes on the imports and documentation
Deleted useless class
Removed useless code
Created bill row fragment xml file
Created bill row fragment class
Created newInstance method on BillRowFragment class
Added methods that adds fields and information to the row
Made BillRow class extends TableRow instead of Fragment
Created BillException class
Modified and added some methods on BillRow class to implement the last changes
Updated methods to implement the new changes on BillRow class
Deleted useless xml