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
Created a static attribute for the content table
User Data Exception
Removed static table, it doesn't work properly
Added a bill constructor that doesn't receive parameters
Implemented new bill constructor in bill row constructors
Author
Merge branch 'master' of https://github.com/KevinAM/TaxBilling into AddEmail
Merge pull request #13 from KevinAM/AddEmail

Merged exceptions on register branch
Implemented textwatcher
Merge branch 'master' of https://github.com/AllanLeon/TaxBilling into ExportBillTable
Moved alertDialog method to a new TableAlertDialog class.
Merged with master
Merge pull request #14 from francomontiel/ElectronicBillImp

Merged electronic bill imp branch
Created new bill constructor method
Updated some lines with the new changes in Bill class