Adds postgresql-server-dev-all to Travis install.

Author: oalders

.travis.yml

@@ -30,8 +30,9 @@ env:
 
 before_install:
   # Run update to make libgmp-dev findable (Required by Net::OpenID::Consumer)
+  # postgresql-server-dev-all is required by DBD::Pg
   - sudo apt-get update
-  - sudo apt-get install libgmp-dev
+  - sudo apt-get install libgmp-dev postgresql-server-dev-all
 
   # We need to run a pre-1.0 instance of ES until we update everything.
   - wget https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-0.90.13.deb