Bar row and progress bars

Styled the bootstrap progress bars to look more like Patternfly. This is the ```.progress``` class and friends.

Added ```.bar-row``` class with javascript backing it to create the overview table row graphs we were talking about on Tuesday.

Both are demoed in STYLE.html.

Implemented in controls.js, which uses a private scope to not litter up global space. See controls.js for how to use ```<div class="bar-row" graph="name" value="10/30"/>``` and ```$cockpit.BarRow("name").attr("value", "10/30");```

Add dependency on attrchange.js which is a jQuery Plugin for reacting to changes in the DOM. Likely unnecessary once we get angular, but for the time being allows us to have very simple interaction with more complex controls.