Merge pull request #95 from mars0i/develop

symmetric? initial version
doc edits
fix NDArray 3x4 matrix multiplication with 4-vector
Update README.md
Update README.md
[maven-release-plugin] prepare release core.matrix-0.19.0
[maven-release-plugin] prepare for next development iteration
Merge branch 'develop' of https://github.com/mikera/core.matrix.git into develop
docs