[Import Error] with openpyxl: specifically w/ pd.to_excel()
from pandas.util.print_versions import show_versions
show_versions()
## INSTALLED VERSIONS

commit: None
python: 2.7.5.final.0
python-bits: 64
OS: Darwin
OS-release: 13.1.0
machine: x86_64
processor: i386
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8

pandas: 0.13.1
Cython: None
numpy: 1.6.2
scipy: 0.11.0
statsmodels: None
IPython: 2.0.0
sphinx: None
patsy: None
scikits.timeseries: None
dateutil: 1.5
pytz: 2012d
bottleneck: None
tables: None
numexpr: None
matplotlib: 1.1.1
openpyxl: 2.0.2
xlrd: 0.9.2
xlwt: 0.7.5
xlsxwriter: None
sqlalchemy: 0.9.4
lxml: None
bs4: None
html5lib: None
bq: None
apiclient: None
## THE CODE

import pandas as pd
import numpy as np
dates = pd.date_range('20130101',periods=6)
df = pd.DataFrame(np.random.randn(6,4),index = dates,  columns=list('ABCD'))
df.to_excel("foo.xlsx")
## ERROR MESSAGE

Traceback (most recent call last):
  File "test.py", line 5, in <module>
    df.to_excel("foo.xlsx")
  File "/Library/Python/2.7/site-packages/pandas/core/frame.py", line 1204, in to_excel
    startrow=startrow, startcol=startcol)
  File "/Library/Python/2.7/site-packages/pandas/io/excel.py", line 530, in write_cells
    style = self._convert_to_style(cell.style)
  File "/Library/Python/2.7/site-packages/pandas/io/excel.py", line 577, in _convert_to_style
    from openpyxl.style import Style
ImportError: No module named style
## ANALYSIS

Went into my site packages -->  openpyxl
Saw that the folder for style has been renamed to styles. 
Did a reinstall of openpyxl with the same results.
Manually renamed to openpyxl.styles, but engendered more bugs (something about borders).
My hypothesis: openpyxl has changed their naming convention that broke the the Pandas.to_excel function.
