#746 Ensure pool maximum capacity is honored

[theigl]

This PR resolves #746.

Limiting a pools maximum capacity is currently broken for two cases:

1. threadSafe=true softReferences=true
2. threadSafe=false softReferences=false

In the first case, LinkedBlockingQueue.add isn't overridden, so an IllegalStateException is thrown when reaching maximum capacity.

In the second case, the wrong method was overridden. ArrayDeck is not wrapped in a SoftReferenceQueue so ArrayDeck.offer is called directly. Internally, it uses addLast instead of add so the overridden method is never called.

I also made a slight change to the code formatting settings that preserves explicit linebreaks. It greatly improves the readability of the test-cases.

[theigl]

@magro: Please review.

[magro]

Cool, thanks for the PR!