Upgraded and alphabetized dependencies.

Upgraded:
* pimple/pimple 1.0.2 => 2.0.0
* dbpatch/dbpatch 1.1.1 => 1.2.0
* openconext/engineblock-fixtures 0.1.6 => 0.3.0
* robrichards/xmlseclibs r50 => r52
* symfony/* 2.4.1 => 2.4.2
* zendframework/zendframework1 1.10.9 => 1.12.3
Bugfix: Pimple 2.0 uses shared functions by default.
Bugfix: also pass along the AuthnContextClassRef, AuthnContextDecl and AuthnContextDeclRef.