Add more Temperature Units and fix Kelvin (redo)



Kelvin does not have a degree symbol. I just switched them so that there is still support for it.

I added Rankine, Delisle, Newton, Réaumur, and Rømer. I rechecked my math. It all works my my site (from my testing).

This is a redo of #21. Travis was annoyed with my tabs and spaces.
Merge pull request #22 from DaAwesomeP/master

Add more Temperature Units and fix Kelvin (redo)