Bump to core/matrix 0.3.0
Fix variadic element-map.
Implement PSliceSeq
Prevent mutating on set-1d
Prevent mutating set-2d.
Fixed length to Euclidean length.
Implement protocol for norms.
Fix first for row matrices.
Remove vector meta-data.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	project.clj
latest deps