Merge branch 'reverting-rs-remove-jquery-blockui' into 'master'

Revert "Merge branch 'rs-remove-jquery-blockui' into 'master'"

This reverts commit bc12750f, reversing
changes made to 8a04b84e.

See merge request !2285

app/assets/javascripts/application.js.coffee

@@ -13,6 +13,7 @@
 #= require jquery.waitforimages
 #= require jquery.atwho
 #= require jquery.scrollTo
+#= require jquery.blockUI
 #= require jquery.turbolinks
 #= require d3
 #= require cal-heatmap