Add generated files to .gitignore #380

Job	Run time
setup	2s
generate-example (heat-capacity)	2m 35s
generate-example (batch-cp2k)	1m 38s
generate-example (sample-selection)	3m 32s
generate-example (path-integrals)	1m 49s
generate-example (dos-align)	6m 11s
generate-example (gaas-map)	4m 50s
generate-example (pi-metad)	4m 6s
generate-example (roy-gch)	3m 30s
generate-example (lode-linear)	3m 21s
generate-example (lpr)	3m 25s
build-and-publish	34s
	35m 33s

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