Fix broken imports in SciPy 1.3

A couple of imports have been removed from `scipy.misc` in version 1.3,
and must be obtained from `scipy.special` instead. This requires at
least SciPy 0.14.0.

environment.yml

@@ -5,7 +5,7 @@ channels:
 dependencies:
 - numpy>=1.12
 - flask>=0.10.1
-- scipy
+- scipy>=0.14.0
 - six
 - h5py
 - pandas

pykat/math/zernike.py

 import numpy as np
-from scipy.misc import factorial as fac
+from scipy.special import factorial as fac
 from six.moves import xrange
 import math
 

pykat/optics/knm.py

@@ -8,9 +8,8 @@ from scipy.integrate import dblquad
 from pykat.optics.romhom import ROMWeights
 from math import factorial
 from pykat.math.hermite import hermite
-from scipy.misc import comb
 from scipy.integrate import newton_cotes
-from scipy.special import gammainc
+from scipy.special import comb, gammainc
 from pykat.math import newton_weights
 
 import time

requirements.txt

 numpy >= 1.12
 flask >= 0.10.1
-scipy
+scipy >= 0.14.0
 six
 h5py
 pandas
 matplotlib
-tabulate
\ No newline at end of file
+tabulate