Adding the ability to have git commit hash in the footer (#78)

Dale Noe

13.56.2018 2a9b72d2ac0250b677aa16791ef16ffae859c7bd

 exampleSite/config.toml

@@ -27,6 +27,9 @@
    hideCredits = false
    hideCopyright = false

    # Git Commit in Footer, uncomment the line below to enable it.
    commit = "https://github.com/luizdepra/hugo-coder/tree/"

    rtl = false

    # Custom CSS