FYI, since people answered this back in October 2013, boostrap 3.1 has container liquid: http://getbootstrap.com/css/#grid-example-fluid (container liquid will expand your content to full page width. Container adds 15px padding left and right).
It is defined on line 755 of the boostrap.css file at the time of this writing.
(What is strange is that it is defined in boostrap.css just like a container (with the addition of 15px), but it definitely works in expanding your content to the full width of the page - I could not find the difference in the CSS file.)
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