Adding an "isVisible" method and using it where appropriate.
Adding an "isVisible" method and using it where appropriate.

Closes #6

Renji/jquery.addressfield,tableau-mkt/jquery.addressfield,CommandLineDesign/jquery.addressfield,Renji/jquery.addressfield,tableau-mkt/jquery.addressfield,Renji/jquery.addressfield,CommandLineDesign/jquery.addressfield,CommandLineDesign/jquery.addressfield