Add template for vconsole

I found that the script for shell is not working very well with vconsole
for linux. This should be a more robust solution to set colors for the
consoles limited by only 16 colors and no fancy escape codes.
Adjust colors for light theme
Fix colors, black/white should be same as bg/fg
Use more readable grey

Also same as iTerm2, so should work with most themes with a light
version
Merge pull request #84 from terlar/vconsole-template

Add template for vconsole