Cakeresqueshell optimizations.

[bar]

DRY when building libraries paths. Do calculations outside the workers loop. Minor optimizations.

[bar]

They are mostly optimizations.

• Reorder startup() like CakeResque::init() to not repeat the code.
• Change self::$cakeResque in favor of CakeResqueShell::$cakeResque to be nice with PHP 5.3.
• In start(), calculate worker arguments once, and not every time for $count workers (all the sibling workers share the same configs).

[wa0x6e]

I was talking about a precise line

[bar]

For what I see, it changes nothing. I'm mobile right now, I'll revert it ASAP.

[bar]

I forgot APP in the rebase :/, I'll fix it later.