Add a tutorial on rotating equivariants #516

Job	Run time
setup	2s
generate-example (rotate-equivariants)	3m 24s
generate-example (lode-linear)	3m 9s
generate-example (roy-gch)	3m 26s
generate-example (dos-align)	5m 52s
generate-example (lpr)	3m 12s
generate-example (batch-cp2k)	1m 49s
generate-example (gaas-map)	4m 11s
generate-example (pi-metad)	4m 14s
generate-example (sample-selection)	1m 57s
generate-example (thermostats)	2m 52s
generate-example (heat-capacity)	2m 19s
generate-example (periodic-hamiltonian)	6m 55s
generate-example (pi-mts-rpc)	6m 18s
generate-example (path-integrals)	1m 58s
build-and-publish	33s
	52m 11s

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