Stop curve handshake when cookie box verification fails
replace macro constants with enum types for user facing constants
Merge pull request #695 from hurtonm/master

Stop curve handshake when cookie box verification fails
distinguish between options and defaults
Merge pull request #696 from calid/enum-constants

replace macro constants with enum types for user facing constants
test for _MSC_VER before using MSVC specific code
WinSock2.h filename should be all lowercase