add index tests
add implementation-check for sparse coercion
extra test for sparse coercion in vectorz
comments on sparse / dense coercion default implementations
update project.clj
[maven-release-plugin] prepare release core.matrix-0.30.2
[maven-release-plugin] prepare for next development iteration
update vectorz-clj dep for testing
Merge branch 'develop' of https://github.com/mikera/core.matrix.git into develop