Update README.markdown
fix image links in readme
describe script API / CSV format
fix linux build script

The Tuner-assembly .jar is in a different position, and
the data-scala cloning can be skipped if the directory is present.
Merge pull request #10 from hmeine/csv_doc

describe script API / CSV format
Merge pull request #9 from hmeine/linux_build

fix linux build script
correctly compute the radius when both axes in the range are negative
Merge branch 'master' into release-0.10.0