Adds capability to run PE on eccentric waveforms

See merge request Monash/tupak!133

Add calibration

See merge request Monash/tupak!113

# Conflicts:
#   examples/open_data_examples/GW150914.py

Merge branch '154-sample_subset-in-priorset-should-not-have-have-list-as-a-default-argument-for-keys' into 'master'

Resolve "`sample_subset` in `PriorSet` should not have have `list()` as a default argument for `keys`"

Closes #154

See merge request Monash/tupak!129

Resolve "`sample_subset` in `PriorSet` should not have have `list()` as a default argument for `keys`"

Update GW150914.py to use tupak.gw.WaveformGenerator

See merge request Monash/tupak!127

Rework ci

See merge request Monash/tupak!125

# Conflicts:
#   tupak/core/prior.py
#   tupak/gw/__init__.py

Minor fix to the creating of `outdir`

See merge request Monash/tupak!123

Clean up of the init

See merge request Monash/tupak!121

The sampler no longer, by default, creates an ourput directory

Previously, outdir was checked and if-not-existing created in a few
different places in two different ways. This (a) makes them all use the
same method (namely the utils function) and (b) places a
check-and-creation call before every tupak output. This will ensure that
changes elsewhere in the code won't cause bugs in the future. Also, if
you choose not to save anything, it won't just make an empty directory.

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