Signature
          
              string os.realpath(string path);
          
          
            
            Expands a path to its actual path. Will resolve things like . and .. and symlinks.
Arguments
    - path
 
    - The path to resolve
 
Notes:
  - If a path cannot be resolved, it will throw an 
IOException. 
Examples:
path = os.realpath("~johndoe/saffire/../test.txt");
// /home/johndoe/test.txt