[git] Use 12 characters for the abbreviated hashes
[git] Use 12 characters for the abbreviated hashes

Use 12 characters for the abbreviated hashes as that is currently the
smallest size that ensures uniqueness.

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Ref: http://blog.cuviper.com/2013/11/10/how-short-can-git-abbreviate/

EDiLD/dotfiles,girishramnani/dotfiles,pbrooks/dotfiles,christophermoura/dotfiles,girishramnani/dotfiles,wingy3181/dotfiles,mickael83/ubuntu-dotfiles,mickael83/ubuntu-dotfiles,newtonne/dotfiles,newtonne/dotfiles,zlot/dotfiles,b-boogaard/dotfiles,AlbertoElias/dotfiles,AlbertoElias/dotfiles,wingy3181/dotfiles,makabde/dotfiles,christophermoura/dotfiles,makabde/dotfiles,oddlord/dotfiles,EDiLD/dotfiles,wingy3181/dotfiles,zlot/dotfiles