Update dependency lists

[wesm]

Notably, newer openpyxl and newer Cython required to build pandas from source and for all tests to pass

Both README.rst and the docs

[jreback]

also...matplotlib is now required to run the tests (was not as of 0.9.1)..

[wesm]

That's an oversight, should skip mpl-depending tests.

[wesm]

@jreback which tests require matplotlib (that don't Skip)?

[jreback]

hmmm....must be mind-playing tricks w.r.t. matplotlib....all tests good except:

ERROR: test_decompression (pandas.io.tests.test_parsers.TestCParserLowMemory)

Traceback (most recent call last):
File "/mnt/home/jreback/pandas/pandas/io/tests/test_parsers.py", line 1768, in test_decompression
import gzip, bz2
ImportError: No module named bz2

(I didnt' have the bz2 libraries installed when i built python) - on linux2...

[wesm]

I skip the gzip/bz2-depending tests now if there is a conflict