- Set plot=False during tests
- Remove verbose=True from nestle calls

1) Remove the prior from the result object: we already save them as a
text file, so I don't think they need to be in the result. For now, I've
only commented them out with a message as there may be someone tempted
in the future to add it back in.

2) If the saving data does error, it now continues (without writing the
data) and prints a big error message.

Adding ASD/PSD normalization functions to utils

See merge request Monash/tupak!28

Time domain strain implementation

See merge request Monash/tupak!22

# Conflicts:
#	tutorials/create_your_own_source_model.py

Merge branch 'master' of https://git.ligo.org/Monash/tupak

Moritz Huebner: Added FFT/IFFT functionality to create strain data for both domains even if only one source model is given.

Moritz Huebner: Added FFT/IFFT functionality to create strain data for both domains even if only one source model is given.

Removes line which saves the raw dynesty output to file

Moritz Huebner: Added FFT/IFFT functionality to create strain data for both domains even if only one source model is given.

- Removes the old custom_source tutorial
- Adds comments to the create_your_own_source_model