pip install does not check for openpyxl
Installed the newest pandas (live on the edge! ;) via pip.
When trying to read an xlsx file I got the known import error.
openpyxl was just not installed.
This should be added as a dependy to setup.py, I guess?
Regards,
Michael

System: Mac OSX 10.7.3, pandas version 0.7.0 installed into EPD 32-bit via pip
