v4.6.0

• Fix Image#exif raising an error when an exif value contains a "=" chracter
• Fix Image#exif raising an error when an exif value spans on multiple lines
• Introduced Image#data as an alternative to Image#details, which uses ImageMagick's ability to retrieve identify -verbose output in JSON format. This eliminates possibility of any parsing errors. It is available on ImageMagick 6.8.8-3 or above.
• Allow Image#format to accept a hash of options as a third argument, which will be added to the convert command before original path is added
• Support Pathname in Image.new, as we already supported Pathname in Image.open
• Added Tool#stdout which adds - to the command (the same as Tool#stdin does)