Generate the instance ID from the configuration itself instead of the spl_object_id of the configuration class

Created a central database class and updated the PDO MetaDataStorangeHandler to use it instead of its own database classes

Fixed bug with adding metadata where it would try to run an UPDATE against the SQL DB if an entry did not already exist.

Support for WantAssertionsSigned and AuthnRequestsSigned in SAML 2.0 SP metadata. New hosted SP configuration option WantAssertionsSigned to control this attribute in exported metadata.

Add metadata signature verification by using pub key from certificate

# By Matt Schwager (1) and Nicholas Amon (1)
# Via Jaime Pérez Crespo (2) and Matt Schwager (1)
* 'master' of github.com:simplesamlphp/simplesamlphp:
  Added documentation for AttributeCopy authentication processing filter.
  Bug fix to include the subject nameid in the data returned from a SAML 1.0 SSO authentication.

Fail more gracefully when the different endpoints are accessed directly. Instead of displaying an "Unable to find the current binding" error message that creates confusion, tell the user it's his fault.

Bug fix to include the subject nameid in the data returned from a SAML 1.0 SSO authentication.

Added documentation for AttributeCopy authentication processing filter.

Adding MDX metadata handler

Solve a security issue with some modules (not validating URLs we are redirecting to) by moving the check to the SimpleSAML_Auth_State::loadState() method.

Typos

Add documentation to sp-remote for signature.certificate