Refactored less workflow to reference Bootstrap sources.

css/variables.less

@@ -1,4 +1,5 @@
 @font-size-small: 12px;
+@line-height-computed: 20px;
 
 // colors
 @timeline-bg: #f5f5f5;
@@ -7,6 +8,8 @@
 @event-core-color: #f0ad4e;
 @event-info-color: #5bc0de;
 @event-warning-color: #d9534f;
+@progress-bg: @timeline-bg;
+@progress-bar-bg: @event-info-color;
 
 // because admin bar is 99999
 @zindex-tooltip: 100000;