changed for self signed ssl support (brianc#1072)

Author: guoxiangyang

README.md

@@ -109,6 +109,28 @@ It's __highly recommended__ you read the documentation for [pg-pool](https://git
 
 [Here is an up & running quickly example](https://github.com/brianc/node-postgres/wiki/Example)
 
+### connect to self signed Postgresql server
+
+Use following config to connect a Postgresql Server self signed:
+
+```
+var config = {
+    database : 'database-name', //env var: PGDATABASE
+    host     : "host-or-ip",    //env var: PGPORT
+    port     : 5432,            //env var: PGPORT
+    max      : 100,             // max number of clients in the pool
+    idleTimeoutMillis: 30000,
+    ssl : {
+        rejectUnauthorized : false,
+        ca   : fs.readFileSync("/path/to/server-certificates/maybe/root.crt").toString(),
+        key  : fs.readFileSync("/path/to/client-key/maybe/postgresql.key").toString(),
+        cert : fs.readFileSync("/path/to/client-certificates/maybe/postgresql.crt").toString(),
+    }
+};
+
+```
+
+For more information about `config.ssl` check [TLS (SSL) of nodejs](https://nodejs.org/dist/latest-v4.x/docs/api/tls.html)
 
 ## [More Documentation](https://github.com/brianc/node-postgres/wiki)
 

lib/connection-parameters.js

@@ -55,7 +55,7 @@ var ConnectionParameters = function(config) {
   this.host = val('host', config);
   this.password = val('password', config);
   this.binary = val('binary', config);
-  this.ssl = typeof config.ssl === 'boolean' ? config.ssl : useSsl();
+  this.ssl = typeof config.ssl === 'undefined' ? useSsl() : config.ssl;
   this.client_encoding = val("client_encoding", config);
   //a domain socket begins with '/'
   this.isDomainSocket = (!(this.host||'').indexOf('/'));