Resolve "Make Interferometers serialisable and add a to_hdf5 method"

Closes #242

See merge request !273

Resolve "PEP8 Imports"

Closes #207

See merge request !230

Resolve #222 Inconsistent use of `priors` and `prior`

Closes #222

See merge request !274

Adds version information to the result object

See merge request !275

1) Rename 'path' to outdir
2) Add detector names to the interferometer list filename
3) Make from_hdf5 method only be given a filename for simplicity

Merge remote-tracking branch 'origin/master' into 242-make-interferometers-serialisable-and-add-a-to_hdf5-method

Bug fix time marginalisation

See merge request lscsoft/bilby!276

Merge remote-tracking branch 'origin/master' into 242-make-interferometers-serialisable-and-add-a-to_hdf5-method

# Conflicts:
#	bilby/gw/detector.py

Encapsulate the lalsimulation function calls

See merge request !266

Resolve "Create single class that handles `duration`, `sampling_frequency`, `start_time`, `frequency_array`, `time_array`, and maybe `frequency_domain_strain`, `time_domain_strain`"

Closes #227

See merge request !257

Resolve "Create single class that handles `duration`, `sampling_frequency`, `start_time`, `frequency_array`, `time_array`, and maybe `frequency_domain_strain`, `time_domain_strain`"

This renames all the cases of "prior" to "priors" in the gravitatinal
wave likelihood.

Update to the main body of the documentation (excluding GW-specifics)

See merge request !270

Add some post processing tools

See merge request !258