Upgrade to Go1.6, use vendor

Also make sure we're using a more recent version of godep

vendor/github.com/lib/pq/oid/doc.go

@@ -0,0 +1,6 @@
+// Package oid contains OID constants
+// as defined by the Postgres server.
+package oid
+
+// Oid is a Postgres Object ID.
+type Oid uint32