Palette Compatibility

The mapping in the `.reg` files is incompatible with the Solarized palette as described on the official website (see the [values table][1]; the third column specifies the mapping for 16-color terminals). This leads to incorrect colors being displayed in command-line applications that use Solarized (such as VIM).

To address this issue, I added two new files with the correct mapping and updated the README.
Also, a small typo in the original files has been fixed.

[1]: http://ethanschoonover.com/solarized#the-values