Log Message:
Changes 1.13:
* Fixed a typo in code for reading a "\b" escape character in strings.
* Improved __repr__ in FloatObject.
* Fixed a bug in reading octal escape sequences in strings.
* Added getWidth and getHeight methods to the RectangleObject class.
* Fixed compatibility warnings with Python 2.4 and 2.5.
* Added addBlankPage and insertBlankPage methods on PdfFileWriter class.
* Fixed a bug with circular references in page's object trees (typically
  annotations) that prevented correctly writing out a copy of those pages.
* New merge page functions allow application of a transformation matrix.