Merge pull request #361 from BBC-News/wraith-3.1

Gemfile

lib/wraith/cli.rb

lib/wraith/compare_images.rb

lib/wraith/crop.rb

lib/wraith/folder.rb

lib/wraith/gallery.rb

lib/wraith/helpers/capture_options.rb

lib/wraith/helpers/custom_exceptions.rb

lib/wraith/helpers/logger.rb

lib/wraith/helpers/save_metadata.rb

lib/wraith/helpers/utilities.rb

lib/wraith/javascript/_helper.js

lib/wraith/javascript/_phantom__common.js

lib/wraith/javascript/casper.js

lib/wraith/javascript/phantom--nojs.js

lib/wraith/javascript/phantom.js

lib/wraith/save_images.rb

lib/wraith/spider.rb

lib/wraith/validate.rb

lib/wraith/version.rb