Add some libraries we need to do image uploading. Configure the PrimeFaces upload filter
Implement image upload.
Images are saved in the glassfish domain under uploads/{user id}/{trip id}/ named as an MD5 hash. Thumbnails are generated and saved under a 't' subdirectory
Remove timestamp validation from JPA entity for uploads.

We'll just allow MySQL to use the default CURRENT_TIMESTAMP for all of the uploaded timestamps