Adds fieldsets as a new form object

This is really helpful for grouping form fields into different
sections, especially for applying CSS
removes the "for" attribute from the legend tag since that's not a valid attribute
Moves field classes to their parent container tag

This allows more control over styling since it allows css to target the
container, the label, and the input field.

This addresses #8
move final closing fieldset tag so it can also enclose the submit button
Merge branch 'fieldset-feature' into field-class-fix
escaped the REQUEST_URI

Escaped the REQUEST_URI.
request for comment on location

Requesting comment on what the $_GET['location'] is supposed to contain, because right now it can contain anything, which isn't good.
Merge pull request #10 from princezuda/master

Security improvement
Merge pull request #7 from philipashlock/fieldset-feature

Adds fieldsets as a new form object
Merge pull request #9 from philipashlock/field-class-fix

Moves field classes to their parent container tag