Handle priors as part of the result object and several other minor fixes

See merge request Monash/tupak!198

Resolve "cpnest broken"

Closes #189

See merge request Monash/tupak!197

Add some tests

See merge request Monash/tupak!193

1) Add version badge
2) Remove inconsistent full stops
3) Add classifiers to setup

Resolve "add `filename=' option to `plot_corner'"

Closes #180

See merge request Monash/tupak!186

Refactor samplers

Closes #163

See merge request Monash/tupak!189

Add contributing guide

See merge request Monash/tupak!179

Update likelihoods

See merge request Monash/tupak!192

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