Update the solorized colors

See https://github.com/amdt/vim-niji/pull/3#issuecomment-19062573
for more info.
Use correct solarized GUI colors

From
https://github.com/altercation/vim-colors-solarized/blob/528a59f26d12278698bb946f8fb82a63711eec21/colors/solarized.vim#L338-L353
Merge pull request #5 from joshuarh/colorscheme-support

Update solarized colors