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

Made some overall improvements and threw out some shoddy stuff that should not have been in there in the first place

Changed the default argument for parameter_conversion to be a lambda expression that is an identity for parameter conversion. This allowed to simplify some more things further down.