Add a tutorial on rotating equivariants #500

Job	Run time
setup	3s
generate-example (rotate-equivariants)	3m 4s
generate-example (lode-linear)	3m 29s
generate-example (roy-gch)	3m 33s
generate-example (dos-align)	6m 48s
generate-example (lpr)	3m 20s
generate-example (batch-cp2k)	1m 51s
generate-example (gaas-map)	4m 26s
generate-example (pi-metad)	4m 11s
generate-example (sample-selection)	3m 36s
generate-example (thermostats)	2m 58s
generate-example (heat-capacity)	2m 28s
generate-example (periodic-hamiltonian)	7m 10s
generate-example (pi-mts-rpc)	6m 32s
generate-example (path-integrals)	1m 50s
build-and-publish	43s
	56m 2s

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