Added zmq_ctx_shutdown to Makefile

- also removed deprecated man pages from Makefile
- they remain in repository for reference

doc/Makefile.am

 MAN3 = zmq_bind.3 zmq_unbind.3 zmq_connect.3 zmq_disconnect.3 zmq_close.3 \
-    zmq_ctx_new.3 zmq_ctx_term.3 zmq_ctx_destroy.3 zmq_ctx_get.3 zmq_ctx_set.3 \
+    zmq_ctx_new.3 zmq_ctx_term.3 zmq_ctx_get.3 zmq_ctx_set.3 zmq_ctx_shutdown.3 \
     zmq_msg_init.3 zmq_msg_init_data.3 zmq_msg_init_size.3 \
     zmq_msg_move.3 zmq_msg_copy.3 zmq_msg_size.3 zmq_msg_data.3 zmq_msg_close.3 \
     zmq_msg_send.3 zmq_msg_recv.3 \
@@ -8,8 +8,8 @@ MAN3 = zmq_bind.3 zmq_unbind.3 zmq_connect.3 zmq_disconnect.3 zmq_close.3 \
     zmq_getsockopt.3 zmq_setsockopt.3 \
     zmq_socket.3 zmq_socket_monitor.3 zmq_poll.3 \
     zmq_errno.3 zmq_strerror.3 zmq_version.3 \
-    zmq_sendmsg.3 zmq_recvmsg.3 zmq_init.3 zmq_term.3 \
-    zmq_proxy.3 zmq_proxy_steerable.3 \ 
+    zmq_sendmsg.3 zmq_recvmsg.3 \
+    zmq_proxy.3 zmq_proxy_steerable.3 \
     zmq_z85_encode.3 zmq_z85_decode.3 zmq_curve_keypair.3
 
 MAN7 = zmq.7 zmq_tcp.7 zmq_pgm.7 zmq_epgm.7 zmq_inproc.7 zmq_ipc.7 \

doc/zmq.txt

@@ -42,17 +42,9 @@ Work with context properties::
     linkzmq:zmq_ctx_get[3]
 
 Destroy a 0MQ context::
+    linkzmq:zmq_ctx_shutdown[3]
     linkzmq:zmq_ctx_term[3]
 
-These deprecated functions let you create and destroy 'contexts':
-
-Initialise 0MQ context::
-    linkzmq:zmq_init[3]
-
-Terminate 0MQ context::
-    linkzmq:zmq_term[3]
-
-
 Thread safety
 ^^^^^^^^^^^^^
 A 0MQ 'context' is thread safe and may be shared among as many application