move progress_bar css from legacy to regular css. add styleguide

app/assets/stylesheets/content/_progress_bar.md

@@ -0,0 +1,11 @@
+# Progress Bar
+
+```
+<span>
+  <span style="width: 100px" class="progress-bar">
+    <span style="width: 40%" class="inner-progress closed"></span>
+    <span style="width: 20%" class="inner-progress done"></span>
+  </span>
+  <span class="progress-bar-legend">60% Total progress</span>
+</span>
+```

app/assets/stylesheets/default.css.sass

@@ -77,3 +77,4 @@
 @import content/grid_table
 @import content/journal
 @import content/pagination
+@import content/progress_bar

app/assets/stylesheets/default_simple.css.sass

@@ -71,3 +71,4 @@
 @import content/modal
 @import content/grid_table
 @import content/pagination
+@import content/progress_bar

app/assets/stylesheets/legacy/main.sass

@@ -38,7 +38,6 @@
 @import "legacy/03_form_error_messages.sass"
 @import "legacy/04_ajax_indicator.sass"
 @import "legacy/05_tooltips.sass"
-@import "legacy/06_progress_bar.sass"
 @import "legacy/07_tabs.sass"
 @import "legacy/08_autocomplete.sass"
 @import "legacy/09_diff.sass"