fix bug if sampling frequency isn't set

See merge request Monash/tupak!122

Clean up saved output

See merge request Monash/tupak!120

Clean up dynesty

Closes #150

See merge request Monash/tupak!118

Closing various issues

Closes #140, #139, and #137

See merge request Monash/tupak!119

1. Removes the samples - these are duplicates of the posterior data
frame
2. Adds option to save the results. For large MC runs, it's not always
neccersery to save the output.
3.

Clean up of setup

Closes #146

See merge request Monash/tupak!117

Closes #141

Closes #141

See merge request Monash/tupak!112

1. Explicit with/without check pointing functions
2. Closes #150 if timing is not succesful it defaults to no
checkpointing
3. General clean up of some doc strings
4. General clean up and commenting of kwargs setup

This was rarely used and should instead be implemented as another
sampler.

The attempt to capture git version information is not much more robust.
If any error is raised, the error is printed, but won't break the
install. This means if, for example, git it not installed then it will
still work.

# Conflicts:
#   tupak/gw/detector.py
#   tupak/gw/likelihood.py

Resolve "Use of `scipy.special._ufuncs.i0e`"

Closes #149

See merge request Monash/tupak!116

Various improvements to the GaussianLikelihood

See merge request Monash/tupak!115

keys() now returns a dict_keys object which is a view. So when the
actual keys are updated, so is this, but we do not want that behaviour.

1) If sigma is not given, then it will not be sampled over (or a warning
raised that you didn't specify a prior for sigma).
2) Comments added to explain the logic throughout
3) Tests added for the Gaussian likelihood

Hyper fix

See merge request Monash/tupak!114

Warnings cleanup

See merge request Monash/tupak!106

# Conflicts:
#	tupak/gw/conversion.py
#	tupak/gw/detector.py
#	tupak/gw/likelihood.py