Merge pull request #400 from KristofferC/kc/extensions #179

Job	Run time
Documentation	2m 10s
Julia 1.0 - ubuntu-latest - x64 - push	14m 9s
Julia 1.0 - ubuntu-latest - x86 - push	15m 6s
Julia 1.0 - macOS-latest - x64 - push	20m 4s
Julia 1.0 - windows-latest - x64 - push	22m 21s
Julia 1.0 - windows-latest - x86 - push	15m 48s
Julia 1 - ubuntu-latest - x64 - push	8m 22s
Julia 1 - ubuntu-latest - x86 - push	10m 26s
Julia 1 - macOS-latest - x64 - push	10m 45s
Julia 1 - windows-latest - x64 - push	13m 8s
Julia 1 - windows-latest - x86 - push	17m 7s
Julia nightly - ubuntu-latest - x64 - push	8m 50s
Julia nightly - ubuntu-latest - x86 - push	10m 47s
Julia nightly - macOS-latest - x64 - push	11m 59s
Julia nightly - windows-latest - x64 - push	13m 38s
Julia nightly - windows-latest - x86 - push	17m 31s
	3h 32m 11s

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