first awk refactor #282

Job	Run time
tests (install_script, bash)	1m 21s
tests (sourcing, sh)	47s
tests (sourcing, bash)	48s
tests (sourcing, dash)	48s
tests (sourcing, zsh)	1m 6s
tests (slow, sh)	3m 8s
tests (slow, bash)	3m 18s
tests (slow, dash)	3m 12s
tests (slow, zsh)	3m 43s
tests (installation_iojs, sh)	1m 5s
tests (installation_iojs, bash)	1m 3s
tests (installation_iojs, dash)	59s
tests (installation_iojs, zsh)	1m 23s
all test suites, all shells	1s
	22m 42s

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