Update Hello, World!.md

Replaced non-functional code sections with text
Update Variables.md

Code sections made to run
Update Passing Arguments to the Script.md

Replaced code sections with text
Update Arrays.md

Make code sections work
Update Basic Operators.md

Make code sections work
Update Basic String Operations.md

Make code sections work
Update Decision Making.md

make code sections work
Update Loops.md

make code work
Update Loops.md

Typo fix
merged
Merge branch 'master' of github.com:ronreiter/interactive-tutorials