Version 2.5.0

• Add new #govuk_select helper. It is to #select what #govuk_collection_select is to #collection_select. Allows more flexibility with option and optgroup elements, including the ability to add custom attributes. More info in the guide. Thanks to @AbigailMcP for suggesting this. #260
• Improve HTML attribute merging, now deeply nested attributes that are space separated lists are properly-merged #256
• Make the format date values can be set in more lenient. Release 2.4.0 introduced a change that made unexpected date formats cause a crash, now a warning will be logged but it will no longer crash #261
• Bump Ruby and Rails to latest versions #262
• Add a missing width from the text field guide entry, thanks @david-mears-dfe for this #263
• Allow the gem's warnings to be suppressed library-wide #264