add: create a many array when a single file is submitted
add(): allowing for `title` & `description` to be saved for single file uploads; index(): remove is_visible
Video Thumbnails & notes about using upload() instead of save()

We used to takeover Media::save() to process uploaded files.  This was preventing us from
easily saving data to the `media` table.

I basically moved all of that upload & processing functionality to a function called upload().
code cleanup
remove Zencoder afterFind
Merge branch 'master' of github.com:zuha/Media-Files-Zuha-Cakephp-Plugin