Changed shortcode options to attributes.
Added image selection information.
Finished thumbnail album
Added shortcode registrations
Created function to create URLs from URL parts
*Broken Commit*
Added URL base variables.
Added options for: grouping images, default classes and appending default classes.
Changed instance return a reference.
Started creating function for handling shortcodes.
Finished get URL functions.
Change resizeImage so you can specify an image name to write the new image to.