SimpleString::StrCmp (2)

1. This implementation works
2. StrCmp and StrNCmp should be similarly implemented (whichever way)
3. More complete tests for both
4. @basvodde Not quite what you had in mind?
Yeah, the missing return 0 will cause compilers to complain though :)

I felt the condition in the return is ok-ish as it is a special situation when the strings are equal except the s2 is longer... 

Either version is ok with me. If we keep your version, then I do suggest putting the while loop back as I never intended for a for loop without a condition. That does look a bit silly to me too :)