Implementation of Robust Adaptive Metropolis (#106) #323

Job	Run time
test (1.6, ubuntu-latest, x86)	2m 27s
test (1.6, ubuntu-latest, x64)	2m 1s
test (1.6, macOS-latest, x64)	2m 36s
test (1.6, windows-latest, x86)	11m 44s
test (1.6, windows-latest, x64)	11m 23s
test (1, ubuntu-latest, x86)	3m 3s
test (1, ubuntu-latest, x64)	2m 24s
test (1, macOS-latest, x64)	4m 54s
test (1, windows-latest, x86)	4m 37s
test (1, windows-latest, x64)	3m 22s
test (nightly, ubuntu-latest, x86)	3m 28s
test (nightly, ubuntu-latest, x64)	2m 35s
test (nightly, macOS-latest, x64)	3m 49s
test (nightly, windows-latest, x86)	4m 36s
test (nightly, windows-latest, x64)	3m 26s
	1h 6m 25s

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