Normal Bootstrap supports animated progress bars.
Are you sure you imported Boostrap files correctly? I think you could only include a CSS file, but not JS. Take a look at the basic template to see which files you should include.
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.setminwidth .progress-bar {
min-width: 20em;
}
setminwidth <uib-element> :
<uib-progressbar class="progress-striped setminwidth" value="22" type="warning">22%</uib-progressbar>
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