Merge pull request #92 from chertov/master

fix vs2013 build, constexpr require VC++ November 2013 CTP update
add CryptoConst to CMakeLists.txt
fill option data for SYN packet
fixed gcc build for FreeBSD
re-create expired tunnels
fixed broken re-created tunnels
compression threshold
Merge pull request #7 from PrivacySolutions/master

Merge pull request from orignal/master