Missing prior distributions in pykima

[Matt-Standing]

When using the following priors listed in "Changing the priors":
Triangular,
Rayleigh,
Fixed

Running 'pykima-showresults' gives the following error:

File "~/anaconda3/lib/python3.7/site-packages/pykima-4.0.2-py3.7.egg/pykima/utils.py", line 332, in _get_prior_parts
raise ValueError('Cannot decode "%s", seems badly formed' % prior)
ValueError: Cannot decode "", seems badly formed

These three distributions are currently missing from pykima.
There is also an additional prior distribution "TruncatedGaussian" which isn't mentioned in the "Changing the priors" page