Take #2. Use the recently migrated SimpleSAML_Logger::maskErrors() and popErrorMask() methods to simplify code un SimpleSAML\Utils\Config\Metadata.

Move the error-reporting logic in SimpleSAML_Utilities to the SimpleSAML_Logger class, and add a new method there to evaluate whether an error would be masked or not according to its level.

RegistrationInfo can be inherited from EntitiesDescriptor

Expose RegistrationInfo in parsed metadata

- Add test case
- Fix .gitignore since it ignored all metadata folders

Add AttributeValueMap Authentication Processing Filter and unittest. 

Add a temporary autoloader that allows loading old classes (SimpleSAML_Path_Something) that have already migrated to namespaces (SimpleSAML\Path\Something), while logging a warning. This commit requires to regenerate the composer autoloader with ./composer.phar dump-autoload.

Make the module autoloader to register class aliases for the classes that are migrated to namespaces, so that they are still accessible via the old name. This keeps everything working while migrating the classes.

Add a PSR-4 autoloader for modules. Now modules can declare their classes under the SimpleSAML\Module namespace.

Fix misplaced </tr> (2x)

The login-page would not verify as valid XHTML 1.0 Transitional

Bugfix. While SimpleSAML\Database::query() returns a PDOStatement, SimpleSAML\Database::exec() doesn't. Make both return an integer with the amount of rows affected. Add a return value to SimpleSAML_Metadata_MetadataStorageHandlerPdo::initDatabase().

Fix missing argument

This fixes:
[Tue Feb 16 13:50:09 2016] [error] [client 10.48.224.4] PHP Warning:  Missing argument 2 for SimpleSAML_Error_AuthSource::__construct(), called in /apps/simplesamlphp-bd-1.14.0/modules/negotiate/lib/Auth/Source/Negotiate.php on line 336 
[Tue Feb 16 13:50:09 2016] [error] [client 10.48.224.4] PHP Notice:  Undefined variable: reason in /apps/simplesamlphp-bd-1.14.0/lib/SimpleSAML/Error/AuthSource.php(31)