Add 'Unzip NSData' about ziparchive

[Coeur]

@AlicanC , istx25 left the project.
The idea seems nice, so I'll reopen this feature request.

[soffes]

Love it. Would be a great addition.

[frytaz]

I have added option to unzip NSData simply by writing this data into temporary location on disk, unzip and remove temporary file. If this solution is fine with You I can make PR with tests.

[karagraysen]

Please create a PR, @frytaz!

[karagraysen]

@frytaz: Please read #163.

[AlicanC]

@istx25 what has happened to this? I couldn't find any info related to this issue in the issue you linked.

Also, @frytaz's solution just adds some developer convenience. It doesn't really matter if the user of the library or the library itself writes to a temp file. No matter who does it, the performance implications will still be there. If the underlying library (minizip?) supports reading from memory, then passing NSData directly to it will reduce IO and increase performance.

Edit: minizip supports this: https://github.com/nmoinvaz/minizip#io-memory