OpenVPN 2.2.1 release

Patches awaiting an ACK

• Patches that fix ​ticket #125
  • ​Fix a build-ca issue on Windows
  • ​Updated "easy-rsa" for OpenSSL 1.0.0
• Patches that fix MinGW builds after above patches have been applied

OpenVPN 2.3

Patches awaiting an ACK

• ​OpenVPN Doxygen patches
• ​Refactor OpenSSL crypto functions