feat(backup_iphoto) Small function that uses Phoshare to export photos from iPhoto - to be synced later with a cloud storage service

Right now it:
* exports all the events
* deletes photos that are no longer in iPhoto (but are in the output folder)
* writes keywords in the exported files
* saves 'faces' info in the metadata
* saves GPS info in the metadata
* updates the exported photos if they changed since the last syncing.
sublime's alias and a way to verify my Sodexo's amount through a python script