Note - this is the default for get_interferometer_with_fake_noise.., not
the default in general.

Makes the options to set the PSD methods. Retains the default behaviour
(will use aLIGO if nothing is set). But now, users must call a
`set_from_` method after initialising the PowerSpectalDensity()`.

Also adds logging messages

Previously, set_from_frame not only loaded in the time domain data, but
also applied a filter and FFT'd. This is no longer required and has
hence been removed.

- Fix error in create psd
- Fix minimum and maximum frequencies
- Improve documentation

Adds functions to set the strain data from open data, generate a PSD,
filter, and window.

- Adds a time_array and time_domain_strain to the
  InterferometerStrainData
- Adds a test for consistency between the time and frequency domain
  strain

- Adds a specific function to work out whether the frequency_array or
sampling frequency and duration where given
- General pep8 clean up
- No changes to functionality

Fixed a bug in create_time_series that produced incorrect time_arrays if a starting time other than 0 is given

Fixed a bug in create_time_series that produced incorrect time_arrays if a starting time other than 0 is given

Fixed a bug in create_time_series that produced incorrect time_arrays if a starting time other than 0 is given

Moves the plot_walker method to the Results object. The benefit here is
that we can generate walker plots after the run and mitigate the chances
of a plot error spoiling a run.

- Also adds ability pass through the 'a' parameter used by emcee

Based on http://corner.readthedocs.io/en/latest/pages/sigmas.html

Make n_check_point estimation round to the nearest order of magnitude.

Fixes #117

This adds methods to __dir__ so that plot_corner and other methods can
be tab completed (in ipython). Unfortunately, this is done by setting
these directly. While this isn't an ideal solution - there is no obvious
way to automate the process as methods to looks up all methods
themselves use the __dir__ attribute causing a recursion error.

Closes #111

- Provides backward compatibility for people with scripts using the old
  style
- Also because, as Colm pointed out, there may be bugger behaviour with
  multiple detectors and it may take a long time to calculate the waveform
- Change the name in `inject_signal` from
  waveform_polarizations->injection_polarizations.

This last step could break peoples code who are using inject_signal
directly, but its probably best to unify notation now rather than have
two names for one thing.