Adding solutions for levels 8, 11, and 12
Merge pull request #191 from donmccurdy/master

Adding solutions for levels 8, 11, and 12
correctly disposing of timers in lvl22
Merge branch 'master' of github.com:AlexNisnevich/untrusted
Merge pull request #192 from someone328/master

Someone328/lv20_solution
Update and rename 20_bodssFight.md to 20_bossFight.md
Update 09_fordingTheRiver.md