Merge 0.7 into master

[codecov[bot]]

Codecov Report

Merging #166 (9f6ba85) into master (dc1fa95) will decrease coverage by 2.66%. The diff coverage is 84.44%.

@@            Coverage Diff             @@
##           master     #166      +/-   ##
==========================================
- Coverage   81.90%   79.23%   -2.67%     
==========================================
  Files          27       19       -8     
  Lines         768      472     -296     
==========================================
- Hits          629      374     -255     
+ Misses        139       98      -41     

Impacted Files	Coverage Δ
src/Stheno.jl	100.00% <ø> (ø)
src/composite/integrate.jl	0.00% <0.00%> (ø)
src/flux/neural_kernel_network.jl	0.00% <0.00%> (-66.67%)	:arrow_down:
src/composite/compose.jl	68.18% <75.00%> (+12.36%)	:arrow_up:
src/sparse_finite_gp.jl	86.66% <86.66%> (ø)
src/abstract_gp.jl	87.50% <87.50%> (+2.71%)	:arrow_up:
src/gaussian_process_probabilistic_programme.jl	94.33% <94.33%> (ø)
src/composite/addition.jl	100.00% <100.00%> (ø)
src/composite/composite_gp.jl	100.00% <100.00%> (ø)
src/composite/cross.jl	97.36% <100.00%> (+11.00%)	:arrow_up:
... and 17 more

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