Added main file for organizing pictures based on EXIF data.
Added main file for organizing pictures based on EXIF data.

- Created PixifImage class which reads a single image file, post-processes EXIF tags into simpler tag names, and adds custom datetime tags.
- Created PixifCollection class which takes a source directory, grabs all files, and turns each file into a PixifImage object.

dgilland/pixif