Fixed test_many_sockets

* failed on systems where process could not allocate 1024 sockets by default
* include path for platform.hpp was wrong; fixed it

Fixed typo in documentation about zmq_proxy_steerable()

Added links to RFCs for socket patterns

remove all asserts during critical section for win32 make_fdpair codepath

handle bind error in make_fdpair() win32 codepath

the size of the critical section is reduced by only entering the critical
section right before the bind().

Revert "Make FD_SETSIZE = ZMQ_MAX_SOCKETS_DFLT + 1 so there is room for ...

Removing C++11 code.

This reverts commit 0b92831b.

Update signaler make_fdpair to set file descriptors to -1 when too many ...

Update signaler make_fdpair to set file descriptors to -1 when too many files are open using socketpair.

Fix socket creation above sistem limits for all 'other' OS not covered b...

Fix socket creation above sistem limits for all 'other' OS not covered by eventfd, windows or vms; enhanced test to create sockets up to a bigger limit to really test hitting the OS limit

Added ignore test case

Signal that the peer performed orderly shutdown

Make FD_SETSIZE = ZMQ_MAX_SOCKETS_DFLT + 1 so there is room for the reaper socket

Get maximum number of sockets it can handle from poller_t

Fixing broken build issue #583

Add test case for many sockets

Simplified error handling for make_fdpair on Windows