Remove examples + screenshots
Use different section decoration
Add the slides
Add rebar demo app sekeleton

Use the latest and greatest rebar
d42ed46835 from 2014-11-28
Add Makefile Emakefile and Guardfile

... to be flexible when showing rebuilds
Do not allow any restarts
Start simple looping server
Gotcha 1: Make loop-call external
Allow supervisor to restart demo_srv
Make demo_srv a gen_server
Add code_change message to demo_srv
Gotcha 2: Ensure crash on #state change
Release demo_1: initial node config
Release demo_2: state upgrade