blinks theme works with light and dark Solarized

The blinks theme now looks good if you're using the light version of the
Solarized color scheme, too.  It still defaults to the dark version, so
it should work as before if you don't override things.  If you're using
the light version, just set SOLARIZED_THEME to "light" before sourcing
oh-my-zsh.
Merge pull request #941 from dcreager/configurable-blinks-theme

blinks theme works with light and dark Solarized