Add two more function to math

- Math_UnitsToKilometers
- Math_UnitsToMiles
Merge pull request #26 from victorngl/master

Add two more function to math
Update some variable names that are now reserved keywords.
Merge pull request #27 from splewis/reserved-words-fix

Update some variable names that are now reserved keywords.
Add missing function calls to test_compile-all.sp and add .gitignore file
Move test setup code to test_compile-all.sh
chmod +x scripting/tests/test_compile-all.sh
test_compile-all.sh: Escape semicolon
test_compile-all.sh: Add missing sed parameter
Add function stock compilation check