upgrade to trusty vm

.travis.yml

@@ -1,3 +1,5 @@
+sudo: required 
+dist: trusty
 language: c
 
 before_install:
@@ -6,8 +8,8 @@ before_install:
   - sudo apt-get -y --purge remove postgresql libpq-dev libpq5 postgresql-client-common postgresql-common
   - sudo rm -rf /var/lib/postgresql
   - wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
-  - sudo sh -c "echo deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main $PGVERSION >> /etc/apt/sources.list.d/postgresql.list"
-  - sudo sh -c "echo deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg-testing main $PGVERSION >> /etc/apt/sources.list.d/postgresql.list"
+  - sudo sh -c "echo deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main $PGVERSION >> /etc/apt/sources.list.d/postgresql.list"
+  - sudo sh -c "echo deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg-testing main $PGVERSION >> /etc/apt/sources.list.d/postgresql.list"
   - sudo apt-get update -qq
   - sudo apt-get -y -o Dpkg::Options::=--force-confdef -o Dpkg::Options::="--force-confnew" install postgresql-$PGVERSION postgresql-server-dev-$PGVERSION
   - sudo chmod 777 /etc/postgresql/$PGVERSION/main/pg_hba.conf