HAVE_CURL_SSL refers to any ssl library, and should be enabled when any backend is being used
Require that compile time and runtime ssl backends are the same
Treat "none" and "other" the same; this unbreaks windows builds with winssl
Test against ssl-less libcurl on travis
I will need to know what libcurl is compiled against on travis
Current travis default is openssl
Fix test suite on ssl-less libcurl
Document new ssl requirements
Merge pull request #121 from p-push/runtime-ssl-check

Runtime ssl check