span.input-append should be glued to input

Created by: buryat

<form>
    <div class="input-append">
        <input class="span2" />
        <span class="add-on">test</span>
    </div>
</form>

<form class="form-horizontal">
    <div class="input-append">
        <input class="span2" />
        <span class="add-on">test</span>
    </div>
</form>

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2.0.3-wip branch, Chrome 18.0.1025.142, Firefox 11.0