Adding PosteriorSampledEmulatedParticleSelection

[jonathanishhorowicz]

• Adding PosteriorSampledEmulatedParticleSelection and corresponding abc_select_emulated_particles function in src/utils/emulation_helpers.jl
• Adding corresponding docstrings
• gp_regression_sample in src/gp/gp.jl can now make multiple samples from the GP posterior
• Updated gp_regression_sample docstrings
• Added unit test for gp_regression_sample
• Added brief discussion of Emulated Particle selection to abc-example.ipynb

[codecov-io]

Codecov Report

Merging #50 into master will increase coverage by 3.29%. The diff coverage is 35.71%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
+ Coverage   70.04%   73.34%   +3.29%     
==========================================
  Files          18       17       -1     
  Lines        1115      919     -196     
==========================================
- Hits          781      674     -107     
+ Misses        334      245      -89

Impacted Files	Coverage Δ
src/util/emulation_helpers.jl	79.16% <0%> (-9%)	:arrow_down:
src/abc/io.jl	77.77% <0%> (+54.86%)	:arrow_up:
src/gp/gp.jl	85.41% <100%> (+2.84%)	:arrow_up:
src/gp/kernels/abstract_kernel.jl	20% <0%> (-20%)	:arrow_down:
src/gp/kernels/scaled_squared_distance.jl	92.85% <0%> (-3.92%)	:arrow_down:
src/abc/summary_stats.jl	94.59% <0%> (-2.71%)	:arrow_down:
src/abc/simulation.jl	100% <0%> (ø)	:arrow_up:
src/gp/kernels/rbf_kernels.jl	100% <0%> (ø)	:arrow_up:
... and 7 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 822af93...70b7eac. Read the comment docs.

[tanhevg]

tidied up some code in superseding #52