Fixed a bug where the "regula-modified" class was being unnecessarily
added to elements. On another note, it seems impossible to test "type
mismatch" validation failures on the "number" type (and I suspect on
other types, except URL and Email). This seems similar to testing
"length" (where a validation failure doesn't happen either). The upshot
is that the browser simply doesn't allow an invalid value to be entered
into the field, and so the "value" attribute of the element never gets
set to that invalid value. So there is nothing for regula to test
against. I need to think of a good way to handle this, or even if it
should be handled at all. If the browser won't let you enter invalid
values, then regula's job becomes much easier.