Merge branch 'release/0.8.0' into develop
Add setLength() method in Vector2 and Vector3
Fix javadoc in Vector3.multiply(float, float, float)
Add missing return statement in Vector2.set(float, float)
Merge branch 'feature/improve-math' into develop
Bump version number to 0.8.1
Update CHANGELOG.md
Merge branch 'release/0.8.1'