changing demo-5 to susy-1
Adding "gulp-combine-media-queries" (and making sure the output is ignored by git)
moving box-sizing: border-box to the global properties (we don't need to demo that explicitly here)

creating an "em" function
creating demos for susy
a little more sass cleanup
listing out the (ahem) "tools" used on RWFJ;
Adding a slide on floats vs. isolate.