Version 1.15

Fixes #28 missing dependency for Perl File::MMagic
Removes local version of perl-net-saml2 in favour of Alpine official package
The previous Version tags were foobared. This is what it should have been:
commit 77d8aa8 (tag: v1.14, origin/master, origin/HEAD)
commit 460b40d (tag: v1.13, tag: 1.13, https)