Added PostgreSQL 9 support.

See 1eccd.
Added pgsql.app.
Added the field vcard.server into pg schema. Fixed string escaping.
username text => username varchar(250). Fixed bytea hex-escaping.
Added pgsql to reltool.config.
Add a dummy application resource file so that ejabberd may be used as a
rebar dependency in other erlang applications
Merge pull request #112 from PaulSD/rebar

Add a dummy application resource file to support building as a rebar dependency
Resource filename must match application name
Merge pull request #113 from PaulSD/rebar

Resource filename must match application name
Merged with arc-mod-mam-release. Monitor ODBC workers and delete crashed ones from Mnesia.
Ensure elists:insert/2 can be substituted with lists:merge/2
Use lists:keymerge/3 not a custom function

As the custom elists:insert/2 was used in only this one place,
the whole module which implements it is not needed anymore.
Fix mod_websockets:peername/1 return value
Fix mod_vcard_odbc wildcard search
Disable SSL 2.0 in TLS driver

SSL 2.0 is not used anywhere as it has security problems. Disable it
unconditionally both in server and client mode. This does _not_
disable support for SSL 2.0 compatible client hello which still will
be accepted in the server mode.
Disable old and unsecure ciphers in TLS driver

Disable:
- export ciphers - broken by design, 40 and 56 bit encryption
- low encryption ciphers - 56 and 64 bit encryption
- SSLv2 ciphers - some ciphers using MD5 MAC
Made tls_drv permanent.
Merge remote-tracking branch 'upstream/master' into arc-mod-mam-only
Made tls_drv permanent.
Update README.md