Module updated with a shim.h header

[ymesika]

1. Created a shim.h header file that holds the openssl includes. @shmuelk suggested this approach as it is platform-independent and does not use absolute paths to the included openssl header files.
2. Added two inline wrapper functions for future ALPN support that only being invoked if the OpenSSL version is 1.0.2 and above.

[billabt]

The biggest question I have is how this was tested? A lot of other Blue frameworks are dependent on this and I can't afford to break them with merge unless I know how it was tested. Thanks.

[ymesika]

We tested it by running the Kitura-Net tests which also test SSL connections.
It was tested both on Linux and Mac (although OpenSSL is not being fetched on Mac).

We've forked BlueSSLService and made only one change to it - depend on this ymesika/OpenSSL.
We then cloned Kitura-Net, updated it to depend on the forked BlueSSLService and ran the tests.
No failures.

[billabt]

If you test it using BlueCryptor as well (it uses the OpenSSL modulemap), I think we'll be all set and I'll do the merge. Thanks.

[ymesika]

Thanks for mentioning BlueCryptor.
I cloned it on a Linux machine, pointed to the updated OpenSSL fork and ran the tests.
No failures.