Adds mime_type field to DoctrineODMImage
Updates IImage to take an SplFileInfo image
Adds getMimeType to IImage
Updates IImage and tests to use an UploadedFile instance
Adds test for IImage::getMimeType()
Implements using the mime-type of the file in DoctrineODMImage
Updates how getMimeType is tested
Adds getExtension to IImage
Implements getting Image extension from UploadedFile
Adds link to image file