Summary:
Ref T1536. LDAP is very likely the worst thing in existence.
This has some rough edges (error handling isn't perfect) but is already better than the current LDAP experience! durrr
Test Plan: Registered and logged in using LDAP.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran, mbishopim3
Maniphest Tasks: T1536
Differential Revision: https://secure.phabricator.com/D6177
