* initial implementation of multidimensional std and var
* consolidated std function into var, cleaned up the interface for var, fixed bias correction
* added documentation of variable axis for std and var
* updated documentation for std and var
* changed the order of normalization and dimension for a three parameter input in the functions
* updated documentation for var and std
* add transform expressions for std and var with variable axis
* added test coverage for std and var with a variable axis
* update to documentation
* change n dim std to use apply function
* fixed tests, removed unnecessary code, updated docs
* fixed typo in docs
* update docs to remove a type
* changed location of apply function
* updated tests to use deepStrictEqual to pass linter
* adding test coverage for var.transform and std.transform
