Abide isequal validation

I had to add an "is equal" validation for a reset password page. In the markup you just set the data-equalto atribute to the id of the value that you want to match:

```
<input type="password" placeholder="confirm new password" required data-equalto="firstPassword">
```

Any recommendation is welcome, thanks!

ps. Sorry for the extra commits, I was working on master first.