Change hillshade's keyword arguments to azimuth and altitude?

[sgillies]

Context: pyOpenSci/software-submission#3.

Could the keyword arguments of

earthpy/earthpy/spatial.py

Line 559 in 16b4288

def hillshade(arr, azimuth=30, angle_altitude=30):

be made more consistent by changing them to azimuth and altitude and dropping the angle_ prefix for the latter?

[lwasser]

totally @sgillies we can do that!! i'm going to allocate some time today and tomorrow to work on these issues!!

[lwasser]

this has been implemented @sgillies !! closing but please reopen if our implementation is not what you intended!! #438 addresses this.