replaced width with height variable
Fixed typo in SimpleWorld iUpdate and fixed an issue where opening a FileOutputStream in SimpleMapIO openStream overwrites file f, leaving it empty. This is an issue when you want to read a map, since the map file was just erased.
Merge branch 'master' of https://github.com/groeneveld/SSEngine into mark

This merge is for me to review changes that mark made to the engine.
Forgot to push fix to issue 7. This should fix issue 7.

As for the other issue, SimpleMapIO has a boolean option now for whether the user wants to open or write to a file. This should prevent the file from being erased when opened. The previous String method compared pointers for Strings instead of the Strings themselves, and would have had unexpected behavior. Hopefully this fixes the MapIO issue. Also I added Mark as an author to the two classes he has contributed to.