LDAP: fix spelling
Switch to textarea to enable configuration of multiple DNs
Base DNs will be used as array, now, to support usage of multiple DNs
support multiple base DNs
support LDAP search using multiple base DNs also with paged results, implements #395
Code style
dechex not necessary, do not waste time with it
Merge pull request #1087 from owncloud/ldap_multiple_dns

LDAP: ability to configure more than one base DN