Add check arguments to save model method

[monkeycatdog]

It will be very convenient to use the save method with a different set of arguments. Added overload.

[coveralls]

Coverage increased (+0.3%) to 91.879% when pulling 672aa427482f4250c37ed08d5170ce6a87a24736 on iamruslanbakirov:check-args-in-save into 65d02f0b1ce8cee83fdfa14145b0220efc6a56c7 on ghidoz:master.