Bump target to iOS7, introduce nullability, always async, and separate storage from queue#22

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gelosi wants to merge 14 commits intothisandagain:masterfrom

Commits on Feb 18, 2016

🍋 sanitise code
gelosi
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Commits on Feb 19, 2016

Commits on Feb 23, 2016

Refactoring part one: removing unnecessary for public use properties of EDQueueJob; introduced EDQueueStoredJob protocol (to be renamed)
gelosi
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Renamed EDQueueStoredJob to EDQueueStorageItem which is way more logical
gelosi
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Refeactor stage two: code Task becomes Tag
gelosi
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Commits on Feb 24, 2016

Commits on Feb 25, 2016

Removes expired jobs along with removing job by ID
gelosi
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Commits on Feb 26, 2016

Queue got jobCount & better scheduling though storage requirement (`fetchNextJobTimeInterval`). Also, fixed critical bug - a race condition in queue. So, job might be executed two times :/ Hola TDD!
gelosi
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Commits on Mar 1, 2016

fixed issue with global dispatch queue (so, each instance if EDQueue will get it's own :)
gelosi
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Commits on Mar 7, 2016

Interface refactoring: removed nullability from attempts property of EDQueueStorageItem protocol (and EDQueueStorageEngineJob respectively), blocked +new method from EDQueueJob ^^,
gelosi
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Commits on Jul 6, 2016

StorageEngine: use more powerful NSKeyedArchiver (allows to store your NSCoded objects)
gelosi
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