Gulp and bower++, could break stuff

static/app/bower_components/bootstrap-datepicker/build/build3.less

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+// Datepicker .less buildfile.  Includes select mixins/variables from bootstrap
+// and imports the included datepicker.less to output a minimal datepicker.css
+//
+// Usage:
+//     lessc build.less datepicker.css
+//
+// Variables and mixins copied from bootstrap 2.0.2
+
+// Variables
+@gray:                   lighten(#000, 33.5%); // #555
+@gray-light:             lighten(#000, 60%);   // #999
+@gray-lighter:           lighten(#000, 93.5%); // #eee
+
+@input-border:                   #ccc;
+
+@brand-primary:         #428bca;
+//@btn-default-color:              #333;
+//@btn-default-bg:                 #fff;
+//@btn-default-border:             #ccc;
+@btn-primary-color:              #fff;
+@btn-primary-bg:                 @brand-primary;
+@btn-primary-border:             darken(@btn-primary-bg, 5%);
+
+
+@btn-link-disabled-color:        @gray-light;
+
+@input-group-addon-bg:           @gray-lighter;
+@input-group-addon-border-color: @input-border;
+
+@font-size-base:          14px;
+@line-height-base:        1.428571429; // 20/14
+@line-height-computed:    floor(@font-size-base * @line-height-base); // ~20px
+
+
+// Mixins
+
+// Button variants
+.button-variant(@color; @background; @border) {
+  color: @color;
+  background-color: @background;
+  border-color: @border;
+
+  &:hover,
+  &:focus,
+  &:active,
+  &.active,
+  .open .dropdown-toggle& {
+    color: @color;
+    background-color: darken(@background, 8%);
+        border-color: darken(@border, 12%);
+  }
+  &:active,
+  &.active,
+  .open .dropdown-toggle& {
+    background-image: none;
+  }
+  &.disabled,
+  &[disabled],
+  fieldset[disabled] & {
+    &,
+    &:hover,
+    &:focus,
+    &:active,
+    &.active {
+      background-color: @background;
+          border-color: @border
+    }
+  }
+}
+
+@import "../less/datepicker3.less";