version bump to 0.9.0, update README (Benchmark, Contributors), CHANG…

…ELOG

update README and CHANGELOG for 0.8.10

update README for 0.8.9

update README: replace nose with pytest

implement astanin#43 recommendation and publish also bdist_wheel

update benchmark table for v0.8.6

update README before the release

convert README from ReStructuredText to Markdown (used pandoc)

update README for v0.8.1

version bump to 0.8.0; update README, contributors etc.