Added support for salting

[AW3i]

I've added support for hash salting and support for more hashing algorithms.

There's a new parameter called saltQuery which is defined in context.xml and expects a DQL Query string to get the salt from a specified table.

The hashAlgorithm in context.xml is now being respected and can be given the following values:

• md5
• sha1
• sha256
• sha512
• PASSWORD_BCRYPT
• PASSWORD_DEFAULT

if none of the above is given the password hashing mechanism just returns the password with no hashing.

[appserver-ci]

Can one of the admins verify this patch?

[appserver-ci]

Can one of the admins verify this patch?

[wick-ed]

Nice, but this might be a good opportunity to drop MD5 support alltogether :)