Add maxConnection environment configuration, have it default to 128

The number gives the maximum number of contemporary connections and
is dimensioned on the limit of open file descriptors found to be
needed on a per-connection basis.

config/environments/development.js.example

@@ -2,6 +2,9 @@ var config = {
      environment: 'development'
     ,port: 8181
     ,host: '127.0.0.1'
+    // Maximum number of connections for one process
+    // 128 is a good value with a limit of 1024 open file descriptors
+    ,maxConnections:128
     // idle socket timeout, in miliseconds 
     ,socket_timeout: 600000
     ,enable_cors: true