Added some more missing configs for 9.3.

templates/master.conf.j2:
- unix_socket_directories is now used in 9.3 instead of
  unix_socket_directory;
- wal_sender_timeout and wal_receiver_timeout is now used in 9.3
  instead of replication_timeout.
Added missing {.
Merge pull request #7 from mtpereira/9.3_configs

Added some more missing configs for 9.3.