Ignore SSL errors by default

Workaround for some knarly old PHP versions.

See consilience/opwall-portal-v2#27

Taking error message from wrong place.

Fix PSR-4 path.

Strange, this worked using `composer dump-autoload` during dev, but
only complains whe installing.

Fix dependency typo.

PSR-4; Guzzle 6.x

Fix functino call typo.