Remove no-longer functional git-pr script
Remove no-longer functional git-pr script

The Github `hub` utilty has added a `pr` subcommand, which takes
precedence over `git-pr` in execution order, so this script is no longer
accessible with `git pr` or `hub pr`.

moofish32/dotfiles,bschmoker/dotfiles,tchiarato/dotfiles,YepengFan/dotfiles,YepengFan/dotfiles,koerbcm/dotfiles,bschmoker/dotfiles,koerbcm/dotfiles,toobulkeh/dotfiles,astoellis/dotfiles,ren/dotfiles,koerbcm/dotfiles,astoellis/dotfiles,tchiarato/dotfiles,koerbcm/dotfiles,moofish32/dotfiles,ren/dotfiles,koerbcm/dotfiles