Added new interface (not implemented yet). Implemented ability to load dictionary like object of meta data for one file.
Removed uneeded read functions from ExifTool. Implemented basic read dictionary interfaces to access meta data.
Fix bug with incorrect getitem implementation.
Implement editing for individual files. ExifTool now starts itself if it wasn't already started, but ensures that it shuts down after execute has finished if it was not started before.
Added bulk editing options via a dict like assignment interface.