implement axes keyword argument in transpose (#735)

* implement axis keyword of transpose

* fix keyword typo

* add 2D transpose tests

* update documentation

* clean up expected values of test scripts

* update missed test script

ix keepdims for min, max, argmin, argmax (#707)

fix keepdims for std, update docs (#704)

fix compilation error for complexes (#694)

Add keyword arguments to spectrogram (#657)

* re-work spectrogram method, so that RAM can be re-used

* update docs with spectrogram changes

fix loadtxt for the case, when built-in complexes are not supported (#…

…666)

ndarray_from_mp_obj correctly treats Booleans (#613)

fix how arctan2 treats scalars (#546)

Merge pull request #456 from v923z/complex2

Complex2

Merge pull request #458 from v923z/sum-fix

Sum fix