FindLibCrypto.cmake is easier to consume

FindLibCrypto.cmake is easier to consume (#44)

related to https://github.com/awslabs/aws-c-io/pull/323

EVP API compat fixes between 1.0/1.1

Merge pull request #42 from awslabs/evp-api-fix

Added workaround for OpenSSL EVP API differences between 1.0/1.1

iOS support

Merge pull request #40 from awslabs/platform

Disabled ecdsa key generation on iOS

Ecc key ref count update

• don't crash on release of null

Ref counting ECC Key Pairs

Merge pull request #32 from awslabs/EccRefCount

Switch to ref counting ecc key pairs

Libcrypto is no longer a private link dependency

Merge pull request #31 from awslabs/libcrypto

Do not make libcrypto private

Stats and other fixes

Merge pull request #19 from awslabs/Stat

* Base statistics gathering and monitoring

ECDSA support, DER/ASN.1 support, cmake /libcrypto inclusion fixes, cmake config template fixes.

Merge pull request #28 from awslabs/dont_leak_deps

Don't leak out platform level dependencies.

Make build friendly to in-source builds.

Merge pull request #25 from awslabs/remove_leftover_link

Removed accidental AWS:: target inclusion.

Make build friendly to in-source builds.

Merge pull request #24 from awslabs/in_source_build

enabled in-source build.