Add basic matrix.

Signed-off-by: CyberZHG <CyberZHG@gmail.com>
Add add, subtract, multipy, toString to matrix.

Signed-off-by: CyberZHG <CyberZHG@gmail.com>
Add transpose and eye for matrix.

Signed-off-by: CyberZHG <CyberZHG@gmail.com>
Update change log.

Signed-off-by: CyberZHG <CyberZHG@gmail.com>
Merge branch 'js_test' into js
Merge branch 'js'