fix(progressbar): allow fractional values for bar width

 * Fractions are limited to two decimals, and are not included in aria values.

Closes #1761

src/progressbar/progressbar.js

@@ -20,7 +20,7 @@ angular.module('ui.bootstrap.progressbar', [])
         this.bars.push(bar);
 
         bar.$watch('value', function( value ) {
-            bar.percent = Math.round(100 * value / $scope.max);
+            bar.percent = +(100 * value / $scope.max).toFixed(2);
         });
 
         bar.$on('$destroy', function() {

src/progressbar/test/progressbar.spec.js

@@ -65,6 +65,27 @@ describe('progressbar directive', function () {
       expect(bar.attr('aria-valuetext')).toBe('60%');
     });
 
+  it('allows fractional "bar" width values, rounded to two places', function () {
+    $rootScope.value = 5.625;
+    $rootScope.$digest();
+    expect(getBar(0).css('width')).toBe('5.63%');
+
+    $rootScope.value = 1.3;
+    $rootScope.$digest();
+    expect(getBar(0).css('width')).toBe('1.3%');
+  });
+
+  it('does not include decimals in aria values', function () {
+    $rootScope.value = 50.34;
+    $rootScope.$digest();
+
+    var bar = getBar(0);
+    expect(bar.css('width')).toBe('50.34%');
+
+    expect(bar.attr('aria-valuenow')).toBe('50');
+    expect(bar.attr('aria-valuetext')).toBe('50%');
+  });
+
   describe('"max" attribute', function () {
     beforeEach(inject(function() {
       $rootScope.max = 200;

template/progressbar/progressbar.html

@@ -1,3 +1,3 @@
 <div class="progress">
-  <div class="progress-bar" ng-class="type && 'progress-bar-' + type" role="progressbar" aria-valuenow="{{value}}" aria-valuemin="0" aria-valuemax="{{max}}" ng-style="{width: percent + '%'}" aria-valuetext="{{percent}}%" ng-transclude></div>
+  <div class="progress-bar" ng-class="type && 'progress-bar-' + type" role="progressbar" aria-valuenow="{{value | number:0}}" aria-valuemin="0" aria-valuemax="{{max}}" ng-style="{width: percent + '%'}" aria-valuetext="{{percent | number:0}}%" ng-transclude></div>
 </div>