Fix missing bdist_wheel

Found this trick at https://github.com/numpy/numpy/blob/master/setup.py

Importing setuptools make numpy's version of setup find the
'bdist_wheel' command. It is now possible to deploy wheel files with

    python setup.py bdist_wheel upload

Signed-off-by: Jonas Kalderstam <jonas@kalderstam.se>
docs on cph
more docs
Merge pull request #64 from spacecowboy/bdist_fix

Fix missing bdist_wheel
adding docs; fixing converg issues ix Cox, rename Cox to CoxPHFitter, adding k_fold
correct import of datasets
...and use it correctly
fixing tests, found crappy pd/np bug
tests can now accept series/np arrays (no df though)
Merge pull request #66 from CamDavidsonPilon/version4point1

v0.4.1
moving changelog to root
rm old changelog
add print option to stat tests, more robust multivariate test
adding better k-fold based on issue #57
oops, I mean #67
remove print
python3 is float division
and range is xrane
adding future division to be consistent
Use integer division