ManualBill and ElectronicBill individualized registration methods
removed unused imports, initialize boolean variables?
Minor changes
Implemented DatePicker popupMessage as new method
Corrected calendarView on DatePicker AlertDialog
Moved alertDialog method to a new TableAlertDialog class.
Merged with master
Merge pull request #14 from francomontiel/ElectronicBillImp

Merged electronic bill imp branch