Merged

1. ​Add support of utun devices under Mac OS X

ACKed, awaits merging

• ​TLS versioning
• ​Updated the TLS negotiation logic to adaptively try to connect using...
• ​Added "setenv opt" directive prefix

Awaiting ACK/NACK

• ​Add support to ignore specific options
• ​Adding support for AEAD cipher modes (AES-GCM, et al.)

Needs testing

Needs modifications

• ​Always load intermediate certificates from a PKCS#12 file

NACKed