Merge pull request #97 from ssnover/tlv-parse-cert-extensions #103

Job	Run time
build_and_test (rustcrypto, stable)	1m 28s
build_and_test (rustcrypto, nightly)	1m 23s
build_and_test (rustcrypto, alloc, stable)	1m 20s
build_and_test (rustcrypto, alloc, nightly)	1m 47s
build_and_test (rustcrypto, os, stable)	3m 0s
build_and_test (rustcrypto, os, nightly)	2m 59s
build_and_test (mbedtls, stable)	1m 46s
build_and_test (mbedtls, nightly)	1m 47s
build_and_test (mbedtls, alloc, stable)	1m 41s
build_and_test (mbedtls, alloc, nightly)	1m 46s
build_and_test (mbedtls, os, stable)	3m 2s
build_and_test (mbedtls, os, nightly)	2m 49s
build_and_test (openssl, stable)	1m 20s
build_and_test (openssl, nightly)	1m 16s
build_and_test (openssl, alloc, stable)	1m 11s
build_and_test (openssl, alloc, nightly)	1m 32s
build_and_test (openssl, os, stable)	2m 37s
build_and_test (openssl, os, nightly)	2m 16s
	35m 0s

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