FundMe validation

Adding javascript to give alert when fields are left empty in the wizard. 
SO i started writing out an example, and then i realized -- why don't you just grab all the values inputted on the step before it changes, and run it through validator.js?  

You're effectively now just creating your own ad-hoc validation.  And it's very stringy and messy.

Holla if it doesn't make sense :)