- complete the radioactive decay example to test the Poisson
   likelihood
 - refs Monash/tupak!132

 - change from using numpy bincount to check for non-negative
   values, as large values can cause a memory error
 - make sure log likelihood returns -inf if any rate values
   are zero
 - refs Monash/tupak!132

 - this example is not finished yet!

 - allow likelihood to use a rate function with a
   dependent variable
 - refs Monash/tupak!132

 - refs Monash/tupak!132

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

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

Previously, outdir was checked and if-not-existing created in a few
different places in two different ways. This (a) makes them all use the
same method (namely the utils function) and (b) places a
check-and-creation call before every tupak output. This will ensure that
changes elsewhere in the code won't cause bugs in the future. Also, if
you choose not to save anything, it won't just make an empty directory.

fix bug if sampling frequency isn't set

See merge request Monash/tupak!122

Clean up saved output

See merge request Monash/tupak!120

Clean up dynesty

Closes #150

See merge request Monash/tupak!118

Closing various issues

Closes #140, #139, and #137

See merge request Monash/tupak!119

1. Removes the samples - these are duplicates of the posterior data
frame
2. Adds option to save the results. For large MC runs, it's not always
neccersery to save the output.
3.

Clean up of setup

Closes #146

See merge request Monash/tupak!117

Closes #141

Closes #141

See merge request Monash/tupak!112

1. Explicit with/without check pointing functions
2. Closes #150 if timing is not succesful it defaults to no
checkpointing
3. General clean up of some doc strings
4. General clean up and commenting of kwargs setup

This was rarely used and should instead be implemented as another
sampler.

The attempt to capture git version information is not much more robust.
If any error is raised, the error is printed, but won't break the
install. This means if, for example, git it not installed then it will
still work.