test_stream failed when response was broken into frames

fix use of CMAKE_SYSTEM_PROCESSOR

Clarified use of secret/public keys

Fixed man page for CURVE key options

Add new tests to CMakeLists.txt

Cleaned up the code

- removed unnecessary malloc
- spaces, not tabs to indent
- renamed control states to be more logical
- renamed SUSPEND to PAUSE, feels more accurate
- fixed indentation, which was off in places

add proxy control flow and test

Use consistant integer type in raw_decoder

Update zmq_msg_init_data.txt

Temporary workaround for broken libsodium install

Load identity message to decoder at start

Fixed out-of-source build

Rename engine's methods to improve code readability

Fixed doc for IDENTITY socket option

Reverted use of enums for zmq.h constants (too painful for binding authors)

This reverts commit d4bb6d69.

This reverts commit e7804c50.

Updated NEWS for 4.0.1 release