update changelog to 180917

See merge request Monash/tupak!190

Adds method to calculate 1D median and quantiles and customise corner titles

See merge request Monash/tupak!185

Update test suite

See merge request Monash/tupak!191

Adds methods to plot data in the time-domain after doing some filtering

Closes #121

See merge request Monash/tupak!161

add storing prior probability of samples

See merge request Monash/tupak!159

1) Rename all tests to the pytest standard naming convention
2) Update to use pytest to run the tests and collect coverage
3) Simplify gitlab CI script using above changes

Adds documentation for implemented samplers

See merge request Monash/tupak!183

Add function to plot data with draws from the posterior and max like

See merge request Monash/tupak!176

Resolve "units in latex labels"

Closes #107

See merge request Monash/tupak!184

Resolve "add neutron star merger to examples"

See merge request Monash/tupak!187

This reverts commit 46b9e61a.

Note - also forces all `__init__` calls in `prior.py` to use key word
arguments to ease changes in the future.

* Adds a CLI arguments `sampler-help` which prints the docstring for the
  given sampler
* Documents each Sampler class with details of the commonly-used kwargs
  and information on where the kwargs are passed (except for pymc3)

Merge branch '176-add-neutron-star-merger-to-examples' of https://git.ligo.org/Monash/tupak into 176-add-neutron-star-merger-to-examples

Revert "Merge branch '176-add-neutron-star-merger-to-examples' into 'master'"

See merge request Monash/tupak!182

This reverts merge request !171

Resolve "add neutron star merger to examples"

See merge request Monash/tupak!171

Previously variables with a fixed (or delta function) prior where not
added to the posterior data frame; the documentation for
`samples_to_posterior` indicates that this is the case. This resolves that.