#5 crash with python3

[Alex Bryant]

fyi
Here's what happens when i run with R 2.10.1

> library(dataframes2xls)
> write.xls(women,'./t.xls')
Traceback (most recent call last):
File "/usr/local/lib/R/library/dataframes2xls/python/csv2xls.py", line 18, in <module>
import pyexcelerator
File "/export/home/local/lib/R/library/dataframes2xls/python/pyexcelerator/__init__.py", line 12, in <module>
from Workbook import Workbook
File "/usr/local/lib/R/library/dataframes2xls/python/pyexcelerator/Workbook.py", line 526
boundsheets_len += len(BIFFRecords.BoundSheetRecord(0x00L, sheet.hidden, sheet.name).get())