remove warning + update xcodeproj to recommended settings

[AndrewSB]

I've removed an if check that was seeing if there was a pointer to NSLinkAttributeName. This will always succeed (in this project) because the deployment target is ios 8.0, and NSLinkAttributeName is marked available since ios 7.

This may have failed previously, but through using a framework it will not, so I think it's safe to remove -- it's also a warning while building the framework.

I also went ahead and update the xcodeproj in Carthage/ to Apple's recommended settings

[codecov-io]

Current coverage is 89.14%

Merging #631 into master will not affect coverage as of 4bc7415

@@            master    #631   diff @@
======================================
  Files            2       2       
  Stmts         1087    1087       
  Branches         0       0       
  Methods                          
======================================
  Hit            969     969       
  Partial          0       0       
  Missed         118     118       

Review entire Coverage Diff as of 4bc7415

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[segiddins]

@AndrewSB if you rebase this, the tests should pass. Thanks!