Change the order of links in developer setup

Mostly you need Maven and PostgreSQL to setup a development
environment.  SSHD is less necessary, unless you need to
hack on its source.

Also added a download link for PostgreSQL to make it easier
to grab the source or a binary.

Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/Documentation/dev-readme.txt b/Documentation/dev-readme.txt
index c7c4312..35ff0bd 100644
--- a/Documentation/dev-readme.txt
+++ b/Documentation/dev-readme.txt
@@ -24,16 +24,17 @@
 Apache Maven:
 
 * http://maven.apache.org/download.html[Download]
-* http://maven.apache.org/run-maven/index.html[Running Maven]
-
-Apache SSHD:
-
-* http://mina.apache.org/sshd/[Apache SSHD]
+* http://maven.apache.org/run-maven/index.html[Running]
 
 PostgreSQL:
 
+* http://www.postgresql.org/download/[Download]
 * http://www.postgresql.org/docs/[Documentation]
 
+Apache SSHD:
+
+* http://mina.apache.org/sshd/[SSHD]
+
 
 Setting up the Database
 -----------------------