Add the Ignore Cache option to Ionic to fix this issue: https://github.com/driftyco/ionic-cli/issues/420

add_ionic_resources_ignore_cache_option.rb

npm_global_path = File.join(system("npm config get prefix"), "lib/node_modules")

file_name = File.join(npm_global_path, "ionic/lib/tasks/cliTasks.js")
File.open(file_name, 'r+') do |f| 
  orig_str = "'--splash|-s': {"
  str = "'--ignore-cache|-c': { title: 'Ignoring cached resources', boolean: true },#{orig_str}"
  f.write File.read(file_name).gsub(orig_str, str)
end

file_name = File.join(npm_global_path, "ionic/node_modules/ionic-app-lib/lib/resources.js")
File.open(file_name, 'r+') do |f| 
  contents = File.read(file_name)

  orig_str = "queueResTypeImages('icon'"
  str = "#{orig_str},options.c || options['ignore-cache']"
  contents.gsub!(orig_str, str)
  
  orig_str = "queueResTypeImages('splash'"
  str = "#{orig_str},options.c || options['ignore-cache']"
  contents.gsub!(orig_str, str)
  
  orig_str = "queueResTypeImages(resType"
  str = "#{orig_str}, ignoreCache"
  contents.gsub!(orig_str, str)
  
  orig_str = "Settings.cacheImages && fs.existsSync"
  str = "!ignoreCache && #{orig_str}"
  contents.gsub!(orig_str, str)
  
  f.write contents
end