As there isn't much more work I can do on this set of shaders that I've built, I am going to upload them to Gumroad.com. I am not expecting to make a profit from these, I am merely putting them there so that anyone who wishes to show their gratitude has a way to do so.
Every one of these shaders is capable of being used independently, and are relatively fast due to the optimisations I have made, but I want to add the disclaimer here that the Unified Shader, being the massive ubershader it is, is slow by nature.
Thanks for all your support guys! If you need anything regarding these shaders, or have questions, PM me.
EDIT : (28/08/2016) I have removed the original post in its entirety as it is no longer relevant to the actual end product that has been achieved over the course of this thread. The original post has been replaced with the above which indicates the current status of everything in this thread.
EDIT: (18/06/2016) Fixed broken link.
EDIT: (20/03/2016) I've update the shader for Blender 2.77 so now it no longer requires the emulated SSS shader that I had built. This has also optimised the shader as there is a reduction in overhead. It also works more efficiently in certain cases (almost on par with using the bare glass, transparent, glossy, etc. shaders) when the additional dispersion effects are disabled.