You may try this code below, it should not be having any issues on using bootstrap-responsive.css
<div class="row" style="border: 1px solid green">
<div class="container" style="border: 1px solid blue; width:100%">
<div class="span2" style="border: 1px solid red">Foo!</div>
<div class="span2" style="border: 1px solid red">Bar!</div>
<div class="span2" style="border: 1px solid red">Baz!</div>
<div class="span2" style="border: 1px solid red">Foo!</div>
<div class="span2" style="border: 1px solid red">Bar!</div>
<div class="span2" style="border: 1px solid red">Baz!</div>
</div>
</div>
Update:
<div class="row-fluid" style="border: 1px solid green">
<div class="container" style="border: 1px solid blue">
<div class="span2" style="border: 1px solid red">Foo!</div>
<div class="span2" style="border: 1px solid red">Bar!</div>
<div class="span2" style="border: 1px solid red">Baz!</div>
<div class="span2" style="border: 1px solid red">Foo!</div>
<div class="span2" style="border: 1px solid red">Bar!</div>
<div class="span2" style="border: 1px solid red">Baz!</div>
</div>
</div>