Some detector refactoring and tests update

See merge request Monash/tupak!136

Resolve "Bug in PowerLaw prior `lnprob` method"

Closes #164

See merge request Monash/tupak!145

make lal_binary_black_hole have the correct length

Closes #134

See merge request Monash/tupak!107

Allows users to give priors as an OrderedDict

See merge request Monash/tupak!142

By putting in the dictionary as an ordered dict, the way priors are
entered determines the order they are plotted, which is what most people
will expect.

- Also adds some catches to help improve error messages for when the
  input prior is something else.

Fixed missing function parameter in several function calls for `asd_from_freq_series`

See merge request Monash/tupak!141

# Conflicts:
#	tupak/gw/detector.py

Resolve "`plot_data` in `Interferometer` is not correctly normalised"

Closes #156

See merge request Monash/tupak!140

# Conflicts:
#   test/waveform_generator_tests.py

Adds more example tests to the CI

See merge request Monash/tupak!128

Simplify wg redundant code

See merge request Monash/tupak!124

Add Poisson likelihood to core likelihood functions

See merge request Monash/tupak!132

Updated the eccentric inspiral example

See merge request Monash/tupak!137