Added release notes for 1.1
subtree merge blosc v1.2.0
Moved package description into Sphinx.

I had to remove the docstrings from blosc/__init__.py because Sphinx.autodoc
insisted in including it automatically, and I have been unable to convince it
of the contrary.  Anyway...
Added the numpydoc sphinx extension for much better rendering
Merge branch 'sphinx' of https://github.com/FrancescAlted/python-blosc into sphinx