Changing iOS deployment target to 8.0. The library works with iOS 7, but...

... modules aren't supported.

Should be changed back to 7.0 when we have some different way of deploying the library.

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So, it worked with iOS 7 for a while, but then I tried to archive, and it failed. Lot's of weird errors like: "Invalid segment alignment" and "Armchair.framework isn't a positional independent component.

Until there is some other type of deployment system which allows for iOS 7, I think we should bump to 8.0. This should cause less problems for people consuming the library.