Fixed bugs in challenges
Added missing files for 05-script.md lesson
Added some of Nelle Nemo's data files
Changed haiku.txt so it matches the 06-find.md lesson
Put randomly generated data in files
Merge pull request #170 from DamienIrving/shell-edits

Small edits/additions to the novice shell lessons - take 2
Adding rules file, fixing links to rules, updating Makefile
Commenting Makefile to explain logic