Update centos-art.sh script.
    
     - Scripts/Bash/Functions/Vcs/Git/git.sh: Execute functionalities
       relative to local working copy.
    
     - Scripts/Bash/Functions/Vcs/Git/git_commitRepoChanges.sh: Set it to
       follow a stage-diff-commit-push flow.
    
     - Scripts/Bash/Functions/Vcs/Git/git_copyRepoFile.sh: Use SOURCE
       instead of LOCATION variable. LOCATION isn't defined here but
       SOURCE is.
    
     - Scripts/Bash/Functions/Vcs/Git/git_deleteRepoFile.sh: Fix regular
       expression matching untracked files.
    
     - Scripts/Bash/Functions/Vcs/Git/git_syncRepoChanges.sh: Added.
    
     - Scripts/Bash/Functions/Vcs/Git/git_updateRepoChanges.sh: Added.