PDO_Sqlite usability

[michalbundyra]

Ideally, we should allow passing the relative path to a SQLite database instead of requiring the absolute path; this is more portable, and more likely expected.

This will likely require a change to the Zend\Db\Adapter\AdapterAbstractServiceFactory class to resolve the filename if a relative path is provided. Alternately, we could do this in zf-apigility via a MERGE_CONFIG listener.

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Originally posted by @weierophinney at zfcampus/zf-apigility-admin#202