adding easyconfigs: gnuplot-5.0.6-intel-2017a.eb, Pango-1.40.5-intel-2017a.eb,...

adding easyconfigs: gnuplot-5.0.6-intel-2017a.eb, Pango-1.40.5-intel-2017a.eb, libgd-2.2.4-intel-2017a.eb, libcerf-1.5-intel-2017a.eb, HarfBuzz-1.3.1-intel-2017a.eb, GObject-Introspection-1.52.0-intel-2017a.eb