Added a reference to @luthaf and updated the links in the plumed tuts #478

Job	Run time
setup	3s
generate-example (lode-linear)	3m 24s
generate-example (roy-gch)	3m 29s
generate-example (dos-align)	5m 58s
generate-example (lpr)	3m 17s
generate-example (batch-cp2k)	1m 51s
generate-example (gaas-map)	4m 17s
generate-example (pi-metad)	4m 6s
generate-example (sample-selection)	3m 23s
generate-example (thermostats)	3m 17s
generate-example (heat-capacity)	2m 23s
generate-example (periodic-hamiltonian)	7m 18s
generate-example (path-integrals)	1m 56s
build-and-publish	34s
	45m 16s

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