merging submodule changes in
merging submodule changes in

girldevelopit/gdi-featured-html-css-intro,gdiboston/gdi-core-html-css,BergFulton/gdi-featured-html-css-intro,Roenok/gdi-core-html-css,gdiboston/gdi-core-html-css,girldevelopit/gdi-featured-html-css-intro,Roenok/gdi-core-html-css,BergFulton/gdi-featured-html-css-intro,gdichicago/intro-html-css,gdichicago/intro-html-css