Merge branch 'file-upload-bugfix' into 'master'

Bugfix for Multiple File Upload Dialogs

Fixes issue #426, where a page with multiple dropzones can accidentally trigger multiple file upload dialogs when the user clicks the "selecting them" link.

By specifying the closest "div-dropzone-wrapper" before sending a click to "div-dropzone", duplicate events are prevented from firing.

See merge request !153

app/assets/javascripts/markdown_area.js.coffee

@@ -179,7 +179,7 @@ $(document).ready ->
 
   $(".markdown-selector").click (e) ->
     e.preventDefault()
-    $(".div-dropzone").click()
+    $(@).closest(".div-dropzone-wrapper").find(".div-dropzone").click()
     return
 
   return