Edit in JSFiddle

(function () {
    webshim.setOptions('forms', {
        lazyCustomMessages: true,
        iVal: {
            sel: '.ws-validate',
            handleBubble: 'hide', // hide error bubble

            //add bootstrap specific classes
            errorMessageClass: 'help-block',
            successWrapperClass: 'has-success',
            errorWrapperClass: 'has-error',

            //add config to find right wrapper
            fieldWrapper: '.form-group'
        }
    });

    //load forms polyfill + iVal feature
    webshim.polyfill('forms');
})();
<form action="#" class="form-horizontal ws-validate">
    <div class="form-group">
        <label for="inputEmail3" class="control-label">Email*</label>
        <input type="email" class="form-control" id="inputEmail3" placeholder="Email" required />
    </div>
    <div class="form-group">
        <label for="inputPassword3" class="control-label">Password*</label>
        <input type="password" class="form-control" id="inputPassword3" placeholder="Password" required />
    </div>
    <div class="form-group">
        <div class="checkbox">
            <label>
                <input type="checkbox" required="" />Remember me</label>
        </div>
    </div>
    <div class="form-group">
        <button type="submit" class="btn btn-primary">submit</button>
    </div>
</form>
body {
    margin: 10px;
    padding: 10px;
}
form {
    max-width: 480px;
    margin: auto;
}
.form-group >[class*="col-"] + .ws-errorbox {
    padding: 0 15px;
}