add code block line numbering option to

browser/styles/main/ArticleDetail.styl

@@ -382,6 +382,9 @@ infoButton()
           color lighten(inactiveTextColor, 10%)
           user-select none
           font-size 14px
+        &.lineNumbered
+          .lineNumber
+            display block
       .CodeEditor
         absolute top left right bottom
         border-top solid 1px borderColor

browser/styles/mixins/marked.styl

@@ -135,19 +135,18 @@ marked()
       &>pre
         border none
         margin -5px
-    &>span
+    &>span.lineNumber
       font-family Monaco, Menlo, 'Ubuntu Mono', Consolas, source-code-pro, monospace
-      display block
+      display none
       float left
       margin 0 0.5em 0 -0.5em
       border-right 1px solid
       text-align right
+      font-size 0.9em
+      line-height 1.65em
       &>span
         display block
         padding 0 .5em 0 1em
-    &>.cl
-      display block
-      clear both
   table
     width 100%
     margin 15px 0 25px