Try setting / removing localStorage value

Safari in iOS will throw a QUOTA_EXCEEDED_ERR when the client attempts to access localStorage while Private Browsing is turned on. 

Simply wrapping the getItem method in a try block does not fix the problem. This commit solves the issue by adding a call to setItem within the try block. removeItem just keeps the code clean.
Merge pull request #25 from joyvuu-dave/master

Try setting / removing localStorage value