on match for hidden forms

If a form is in a panel (eg foundations tabs) the js will still validate when the form is revealed & the user clicks submit - because of the onmatch wrapper.
Merge pull request #16 from asecondwill/master

on match for hidden forms
Using empty with eval was a bad idea

Replace empty with a simple == ""
Merge pull request #17 from lekoala/master

Using empty with eval was a bad idea
Merge branch 'master' of git://github.com/sheadawson/silverstripe-zenvalidator