Enable tlsOptions by upgrading ldapjs

I need to use `ldaps://` protocol to connect to the LDAP server in our organization. In order for the connection to succeed I need to be able to pass the CA certificate to tls module.

Latest ldapjs `Client` supports [passing the tlsOptions](https://github.com/mcavage/node-ldapjs/blob/4097a777e9ded774760944fe341be252f4adf8c6/lib/client/client.js#L234) to the tls module. This pull request upgrades ldapjs and adds `tlsOptions` (as well as `timeout` and `connectTimeout`) options to `LdapAuth` constructor.