Merge pull request #16 from laszlokorte/doubles-master

change attribute type hints form num to double
Merge pull request #15 from laszlokorte/browser_dependency

add browser package as dev dependency
use vector_math library instead of custom vector implementation.
remove Vector2_crossNumAndVectorToOut. It does nearly the same as Vector2_crossVectorAndNumToOut.
use vector_math's crossInto() method instead of Vector3_crossToOut
use vector_math's transformed() method instead of Matrix2_mulMatrixAndVectorToOut
use vector_math's transposed() ans transformed() instead of Matrix2_mulTransMatrixAndVectorToOut
decrease line length
remove ternary operator
change typehints from num to double
use setAsBox
fix method name