postgresql: upgrade to 9.4

Close #8

Author: Sameer Naik

Changelog.md

@@ -1,5 +1,8 @@
 # Changelog
 
+**latest**
+- postgresql: upgrade to 9.4
+
 **9.1-2**
 - use the official postgresql apt repo
 - feature: automatic data migration on upgrade

Dockerfile

@@ -1,7 +1,7 @@
 FROM sameersbn/ubuntu:14.04.20150120
 MAINTAINER sameer@damagehead.com
 
-ENV PG_VERSION 9.1
+ENV PG_VERSION 9.4
 RUN wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - \
  && echo 'deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main' > /etc/apt/sources.list.d/pgdg.list \
  && apt-get update \