Added Net::LDAP::Entry object to strategies test
Added respond_to? check to user mapping function

Net::LDAP::Entry returns empty array if key not
exists, so we should check for key with respond_to?
Merge branch 'map-userinfo-fix' of github.com:syndicut/omniauth-ldap into syndicut-map-userinfo-fix

Conflicts:
	spec/omniauth/strategies/ldap_spec.rb
removed the rspec deprecation.