correction from rc1

matplotlib 1.4.1rc1 was only in python3.4 versions.
sphinx in python2.7 versions was made with erroneous Sphinx-1.2.3-py3-none-any.whl

==> Re-spin with  : 
- matplolib 1.4.1 final,
- Sphinx-1.2.3-py3-none-any.whl for python 2.7 versions,
- cython 0.21.1 bug fix, released last night,
- pandas 15.0 "recommanded upgrade", released last night.