[BUGFIX] Doctrine DocParser ignores Flow autoloader
The Doctrine DocParser does not utilize the autoloaders
registered into spl_autoload. This change registers
the Flow autoloader into Doctrines AnnotionRegistry so
it will be used in the lookup.
The error only occurs in Production context, but
it's hard to say how this change can be verified as
it seems to be very specific when the error occurs
and does not have to occur for all controller /
action combinations in the application.
Releases: master, 2.0