Add a tutorial on rotating equivariants #501

Job	Run time
setup	3s
generate-example (rotate-equivariants)	3m 19s
generate-example (lode-linear)	3m 14s
generate-example (roy-gch)	3m 32s
generate-example (dos-align)	6m 12s
generate-example (lpr)	3m 16s
generate-example (batch-cp2k)	1m 53s
generate-example (gaas-map)	5m 16s
generate-example (pi-metad)	4m 10s
generate-example (sample-selection)	3m 45s
generate-example (thermostats)	3m 6s
generate-example (heat-capacity)	2m 31s
generate-example (periodic-hamiltonian)	7m 33s
generate-example (pi-mts-rpc)	6m 25s
generate-example (path-integrals)	1m 58s
build-and-publish	42s
	56m 55s

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