Stringy must correctly handle non-string arguments and implicitly cast to string to avoid problems in __toString() method
Implicit cast argument to string in constructor
primitives check in constructor & toString
Stringy->$str became private to ensure its sting content and guarantee zero-exception __toString() execution
titleize refactoring to avoid visibility problems in PHP 5.3
fixed T_OBJECT_OPERATOR issue in PHP 5.3
Merge Pull Request #18
Require objects to have a __toString method, update readme