Use a released copy of OM
Migrate to ldap
Don't store ldap config
Pinning devise_ldap_authenticatable to a specific commit

Pending a new release of devise_ldap_authenticatable, adding commit ref so unanticipated changes don't creep in unannounced.  Should be changed to point at official rubygems release once it comes out.
Merge remote branch 'origin/ldap' into ldap

Conflicts:
	Gemfile
	Gemfile.lock