[Hydrator][Hotfix] Fix addStrategy bug

Check for only collection valued association before throwing exception when adding strategy.
Update src/DoctrineModule/Stdlib/Hydrator/DoctrineObject.php
[Hydrator] Check if null values are allowed
Ignore invalid null values
Create OneToOneEntityNotNullable.php
Update tests/DoctrineModuleTest/Stdlib/Hydrator/DoctrineObjectTest.php
Update docs/hydrator.md
Fix doc
Remove reference to deprecated ORM hydrator
call hydrateValue also on simple fields in case a strategy is attached
Fix #176: Add zend-config dependency
Update paginator.md

Unless I misunderstood, this makes more sense.
Minor fix to the readme
Fixed typos
Cleaning up test suite to use real unit testing
Fixing coverage checker to reflect current test suite status
CS fixes in `src/`
CS fixes in the test suite
Limiting CS scans to 5.4
Add Selectable Paginator

Add count

Hack

Change count

As Selectable always load a whole collection to do a count, we just
return 0. It's up to the developer, if he/she needs the complete count,
to use a repostiroy for that

Bring back