Merge pull request #95 from ssnover/fix-armfailsafe-command-arg-types #100

Job	Run time
build_and_test (rustcrypto, stable)	1m 9s
build_and_test (rustcrypto, nightly)	1m 8s
build_and_test (rustcrypto, alloc, stable)	57s
build_and_test (rustcrypto, alloc, nightly)	1m 8s
build_and_test (rustcrypto, os, stable)	1m 0s
build_and_test (rustcrypto, os, nightly)	54s
build_and_test (mbedtls, stable)	1m 9s
build_and_test (mbedtls, nightly)	1m 11s
build_and_test (mbedtls, alloc, stable)	1m 10s
build_and_test (mbedtls, alloc, nightly)	1m 11s
build_and_test (mbedtls, os, stable)	1m 10s
build_and_test (mbedtls, os, nightly)	1m 9s
build_and_test (openssl, stable)	1m 8s
build_and_test (openssl, nightly)	1m 10s
build_and_test (openssl, alloc, stable)	1m 10s
build_and_test (openssl, alloc, nightly)	1m 11s
build_and_test (openssl, os, stable)	1m 8s
build_and_test (openssl, os, nightly)	53s
	19m 56s

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