Added iframe resizer to the project

Gemfile

@@ -131,6 +131,7 @@ group :development, :test, :assets do
   gem 'font-awesome-sass'
 
   source 'https://rails-assets.org' do
+    gem 'rails-assets-iframe-resizer'
     gem 'rails-assets-jquery-sparkline'
     gem 'rails-assets-jquery-visible'
     gem 'rails-assets-leaflet'

Gemfile.lock

@@ -297,6 +297,7 @@ GEM
       bundler (>= 1.3.0)
       railties (= 5.2.3)
       sprockets-rails (>= 2.0.0)
+    rails-assets-iframe-resizer (4.1.1)
     rails-assets-jquery (3.4.0)
     rails-assets-jquery-sparkline (2.1.3)
     rails-assets-jquery-visible (1.2.0)
@@ -479,6 +480,7 @@ DEPENDENCIES
   puma (~> 3.7)
   rack-livereload
   rails (>= 5.1.4)
+  rails-assets-iframe-resizer!
   rails-assets-jquery-sparkline!
   rails-assets-jquery-visible!
   rails-assets-leaflet!

app/assets/javascripts/application.js.coffee

@@ -10,6 +10,7 @@
 # Read Sprockets README (https://github.com/sstephenson/sprockets#sprockets-directives) for details
 # about supported directives.
 #
+#= require iframe-resizer
 #= require jquery3
 #= require jquery_ujs
 #= require jquery-sparkline