Now with 17% less fat:
* Moved validation logic into OuroborosPost for sanity
* Added sanity checks for OuroborosPost values
* Changed defaults to be more sane (mainly tags)
* OuroborosPost now accepts an MD5 hash along the metadata (like it
should!)
* Fixed dupe handling logic
Due to how FILTER_SANITIZE_STRING works, if you had special chars in
your tags (eg. <3 or !) the string would be cut before the offending
character(s) and in worst case, result in no tags passing to the API
Also some code formatting and a redirect from post/show for clients such
as CartonBox so you can actually view the image after opening it in the
browser on the client.
