Convert to our wrapper class for assertions

* Migrate assertions to Webmozart

add store option to SQLPersistentNameID

PSR-12 compliancy

This reverts commit ef36c5fd.

All a bit too involved right before a planned release.

Also, convert to PSR-2 where that was still lacking in these files.

NameIDPolicy is not a valid configuration option in remote SP metadata, and therefore it doesn't make sense to use it in a filter generating persistent NameIDs (IdP side).

This resolves #519.

Now we are finally using the 2.x branch of the SAML2 library, which was also migrated to use namespaces. Even though the library provides an autoloader that allows loading the classes with the old names using class aliasing, we need to do the migration in one commit (at least for most part of it). This is due to the way SimpleSAMLphp checks data types, using inheritance to check objects agains abstract or more general classes. Even though class aliasing works, there's no way to replicate those relationships, and type checks that use the old class names will fail because the aliases are virtually new classes that don't inherit from others.

Provide config options to allow SQLPersistentNameID to be less conservative about creating entries in the SQL datastore, whilst preserving default behaviour

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2781 44740490-163a-0410-bde0-09ae8108e29a