Functionality & styling improvements

Added (and managed to get working) Flickr Photoset & Image tag plugins for displaying images and galleries from Flickr rather than self hosting them
Updated the following posts to make use of the new Flickr plugin:
 * Instagram Digest Oct 2013
 * Instagram Digest Nov-Dec 2013
Finally fixed the menu styling so the dropdowns now show up directly below the menu item (at least in Chrome for Windows, I will have to check that out later)
Moved scripts, css & images into an 'assets' folder, will be adding other things to this once the site is fully up and running