Please consider add a new Git consistent color scheme

Hi,
  I'm glad to see this bash-git-prompt project is being actively maintained and continue to deliver values.

  However, I'd like to have color scheme which is consistent w/ the one used by Git. That is:
 
1. show number of untracked, conflicted and modified files in red
2. show number of staged files in green

Since user not only uses the number indicated by the prompt but also need drill down to the specific files, if base-git-prompt display default color scheme uses different color than the Git built-in, it confuses user.

This PR is intended to implement this idea in the additional "Solarized_Git" theme.
I think, just changing the default theme could embarrass a lot of people, because this prompt is quite widely used. How about this solution:
1. Rename the `Default.bgptheme` to `Default.original.bgptheme`
2. make a Symlink named `Default.bgptheme` to `Default.original.bgptheme`
3. Make a copy of `Default.original.bgptheme` named `Default.GitLike.bgptheme` (or what you prefer) and make your changes there
4. Now you can set the Default Theme globally by setting the symlink. (maybe in the Package creation script). 

So the user can decide, which Default theme he likes better, but we have still the original theme by default around.