chapter 10, up to 10.2.1. making show page for micropost
chapter 10, up to listing 10.27
chapter 10, up to listing 10.34. after changing object: f.object
chapter 10, up to listing 10.35, start to add feed in next step.
chapter 10, up to 10.3.4.  added feed, about to add destroy microposts in feed.
done chapter 10 without exercises. no errors. done post, feed and destroy in feed.