a bit more work on creation.rst

--HG--
extra : amend_source : 5cded3e533b79955386b039c0b5e8b8bdce37bc9
 explicitly support and test 3.4
reorganize according to best packaging practices

--HG--
rename : LICENSE.txt => LICENSE.rst
rename : doc/Makefile => docs/Makefile
rename : doc/api_reference.rst => docs/api_reference.rst
rename : doc/cli.rst => docs/cli.rst
rename : doc/conf.py => docs/conf.py
rename : doc/creation.rst => docs/creation.rst
rename : doc/index.rst => docs/index.rst
rename : doc/make.bat => docs/make.bat
rename : experimentator/__init__.py => src/experimentator/__init__.py
rename : experimentator/cli.py => src/experimentator/__main__.py
rename : experimentator/__version__.py => src/experimentator/__version__.py
rename : experimentator/design.py => src/experimentator/design.py
rename : experimentator/experiment.py => src/experimentator/experiment.py
rename : experimentator/order.py => src/experimentator/order.py
rename : experimentator/section.py => src/experimentator/section.py