The current method used by this library uses NSTask to spin up an
externally running task to unzip the fixtures, this will not work on iOS
as this functionality is not allowed. Switching to use ZipArchive, as
noted by @modocache, provides a portable way of extracting fixtures.
updated to Xcode 7.2 recommended settings
integrated with Nimble (v3.0.0), Quick (v0.8.0), Result (1.0.1)
integrated with Guanaco (5031bf67297afbe61ac0f2fbf3e3e8400b3f8888) that supports Swift 2.0
Guanaco provides Nimble assertions for LlamaKit.Result, such as:
```
expect(result).to(haveFailed(domain: "com.libgit2"))
```
These custom assertions will be useful when testing that libgit2 error
messages are properly captured and reported.
