Fixing admin API test of resource order. Fixing syntax to support old Ruby
Increment version to v1.0.73: Support dpr transformation parameter, Support automatic dpr (for HiDPI) and automatic width (for responsive), Accept timestamp parameter in upload method options, Support pHash info in admin API, Support the multiple upload flag directly in cl_image_upload_tag, 'secure' configuration parameter from environment variable, Make api_key and api_secret optional in unsigned upload, Support the case Rails is defined but Rails.root isn't.