First commit of code from chapters 6-12 (unedited and not re-tested)

new file:   code/ch06/ex1-product/overall.ex
	new file:   code/ch06/ex2-drop/drop.ex
	new file:   code/ch06/ex2-drop/listdrop.ex
	new file:   code/ch06/ex3-drop/drop.ex
	new file:   code/ch06/ex3-drop/listdrop.ex
	new file:   code/ch06/ex4-pascal/pascal.ex
	new file:   code/ch07/ex1-hof/hof.ex
	new file:   code/ch08/ex1-simple/bounce.ex
	new file:   code/ch08/ex10-resilient/drop.ex
	new file:   code/ch08/ex10-resilient/mph_drop.ex
	new file:   code/ch08/ex2-recursion/bounce.ex
	new file:   code/ch08/ex3-counter/bounce.ex
	new file:   code/ch08/ex4-state/bounce.ex
	new file:   code/ch08/ex5-division/bounce.ex
	new file:   code/ch08/ex6-talking/drop.ex
	new file:   code/ch08/ex7-talkingProcs/drop.ex
	new file:   code/ch08/ex7-talkingProcs/mph_drop.ex
	new file:   code/ch08/ex8-linking/drop.ex
	new file:   code/ch08/ex8-linking/mph_drop.ex
	new file:   code/ch08/ex9-trapping/drop.ex
	new file:   code/ch08/ex9-trapping/mph_drop.ex
	new file:   code/ch09/ex1-tryCatch/drop.ex
	new file:   code/ch09/ex1-tryCatch/drop2.ex
	new file:   code/ch09/ex1-tryCatch/drop3.ex
	new file:   code/ch09/ex3-dbg/drop.ex
	new file:   code/ch09/ex3-dbg/mph_drop.ex
	new file:   code/ch09/ex4-dbg/fact.ex
	new file:   code/ch09/ex5-testing/drop.ex
	new file:   code/ch09/ex5-testing/drop_bad.ex
	new file:   code/ch10/ex1-records/recordDrop.ex
	new file:   code/ch10/ex1-records/records.ex
	new file:   code/ch10/ex2-records/recordDrop.ex
	new file:   code/ch10/ex2-records/records.ex
	new file:   code/ch10/ex3-records/recordDrop.ex
	new file:   code/ch10/ex3-records/records.ex
	new file:   code/ch10/ex4-ets/planemoStorage.ex
	new file:   code/ch10/ex4-ets/records.ex
	new file:   code/ch10/ex5-ets/planemoStorage.ex
	new file:   code/ch10/ex5-ets/records.ex
	new file:   code/ch10/ex6-ets-calculator/drop.ex
	new file:   code/ch10/ex6-ets-calculator/mph_drop.ex
	new file:   code/ch10/ex6-ets-calculator/records.ex
	new file:   code/ch10/ex7-mnesia/drop.ex
	new file:   code/ch10/ex7-mnesia/mph_drop.ex
	new file:   code/ch10/ex7-mnesia/records.ex
	new file:   code/ch10/ex8-qlc/records.ex
	new file:   code/ch10/ex8-qlc/test.ex
	new file:   code/ch11/ex1-drop/drop_server.ex
	new file:   code/ch11/ex2-drop-sup/drop_server.ex
	new file:   code/ch11/ex2-drop-sup/drop_sup.ex
	new file:   code/ch11/ex3-drop-app/drop_app/.gitignore
	new file:   code/ch11/ex3-drop-app/drop_app/README.md
	new file:   code/ch11/ex3-drop-app/drop_app/lib/drop_app.ex
	new file:   code/ch11/ex3-drop-app/drop_app/lib/drop_app.ex~
	new file:   code/ch11/ex3-drop-app/drop_app/lib/drop_server.ex
	new file:   code/ch11/ex3-drop-app/drop_app/lib/drop_sup.ex
	new file:   code/ch11/ex3-drop-app/drop_app/mix.exs
	new file:   code/ch11/ex3-drop-app/drop_app/mix.exs~
	new file:   code/ch11/ex3-drop-app/drop_app/test/drop_app_test.exs
	new file:   code/ch11/ex3-drop-app/drop_app/test/test_helper.exs
	new file:   code/ch12/ex1-difference/difference.ex
	new file:   code/ch12/ex1-look/testor.ex
	new file:   code/ch12/ex2-double/double.ex
	new file:   code/ch12/ex3-double/double.ex
	new file:   code/ch12/ex4-unless/logic.ex
	new file:   code/ch12/ex5-mnesia/drop.ex
	new file:   code/ch12/ex5-mnesia/mph_drop.ex
	new file:   code/ch12/ex5-mnesia/planemo.ex
	new file:   code/ch12/ex5-mnesia/records.ex