Sort IdP's in alphabetical order in dropdown.

Only show languagebar when there's something to choose.

If you configure language.available to just one language, e.g. "en",
you get a language bar with just the unclickable word "English" which
is rather unuseful.

`preg_match` returns `0` if no matches are found, `FALSE` only on error. This means that with the previous check unmatching certificates would not be identified, only when the preg_match itself would error.

Remove extra URL validation as normalizeURL() will have done that already. Return an empty string if the input URL is empty (disregarding its type). This should make the checkURLAllowed() function transparent and avoid it returning the current URL (normalized) when input is empty. Fixes #99.

Avoid calling SimpleSAML_Utilities::normalizeURL() twice when we are redirecting and need to check if the URL is trusted.

Add NameIDFormats to output of getMetadata20IdP()

Fixes a notice on page load.

Extract constant information out of the getContact() function and make it public static properties of the class.

# By Thijs Kinkhorst
# Via Jaime Pérez (1) and Thijs Kinkhorst (1)
* 'master' of github.com:simplesamlphp/simplesamlphp:
  composer: replace xmlseclibs svn source with our git copy

Migrate hosted IdP metadata to use the new getContact() helper function. Include also the contact information in SSP generated configuration. Honour contact configuration in hosted metadata, the same way as in hosted SP metadata. Solve #101.

Migrate hosted SP metadata to use the new getContact() helper function. Include also the contact information in SSP generated configuration.

Start using the new helper function for contact configuration validation in SAMLBuilder. Change the documentation to warn about upcoming changes.

composer: replace xmlseclibs svn source with our git copy

This mirrors the configuration used in simplesamlphp/saml2.
It lifts the requirement to have subversion present on your machine.

Merge branch 'spremote-privatekey' of https://github.com/dtsosie/simplesamlphp into dtsosie-spremote-privatekey

* feature/short-sso-trackid:
  Add the tracking identifier to the error message, so that we can track the logs and see what happened when someone gets this error.