Update README.md

set release version 0.1.1 (SciTools#33)

REL: Update version

Fix interpolate z_target nd

Merge pull request SciTools#8 from ocefpaf/win_vc9_friendly_version

Windows vc9 friendly version

Merge pull request SciTools#7 from bjlittle/alpha-version

Tidy setup.py and pin to first alpha version.