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feat: add Equal method to compare keys

Closes #125

* ed gen, sign, verify works. tested25519 fails
* Ignore some unit tests in ED since it relies on GoLang lib to support Ed keys
* Cleanup sign and verify operations
* Cleanup and prettify
* cleanups
* Conditional X_EVP_PKEY_ED25519 and  X_EVP_Digest{Sign|Verify}[Init] based on openssl version.

closes #61

Go can use 16 bytes to store an IPv4 address in a net.IP so it needs to
be converted to a 4-byte representation first.

This reverts commit 6eae62b0.
This reverts commit baa1f625.

Leaves in the removal of -w from the darwin LDFLAGS as it is still
problematic on 1.9.5 and 1.10.1.

Make test confom to new requirement enforced in go 1.10 https://tip.golang.org/doc/go1.10#test. With out this change tests will always fails with go 1.10+.

Fix incompatiblities with OpenSSL 1.0.x

cgo starts exiting when pkg-config doesn't work, so limit calling
pkg-config to linux and windows.

we also need to specify -lssl and -lcrypto in the linker flags
when we don't have pkg-config

this way if you don't have openssl@1.1 installed, it doesn't complain at you

- created a uniform shim layer for the Go code to invoke that does the
  right thing depending on the version of openssl. functions that have
  yet to be moved can be done so as needed.

- fixed the incorrect use of X509_STORE_CTX_get_app_data in verify_cb to
  pull out the SSL object from the x509 store context, which causes
  crashes when the SSL object index happens to not be zero.

- fix engine not being passed to HMAC_Init_ex

- fix HMAC tests not checking for failures with NewHMAC