[Initial import of rope-bytestring library.
Johan Tibell <johan.tibell@gmail.com>**20071007102647] 
[Added core functions and some properties.
Ivan Tarasov <Ivan.Tarasov@gmail.com>**20071007155053] 
[Fixed duplicate instances definitions for -> and (,).
Ivan Tarasov <Ivan.Tarasov@gmail.com>**20071007160214] 
[Refactored code to follow ByteString conventions.
Johan Tibell <johan.tibell@gmail.com>**20071007221711]