Remove failing brew command from travis.yml.
Don't use libunwind on ARM.
xctool needs SDK specified.
[XCTEST] Add functional tests for XCTest subspec.
Merge branch 'fix-travis-yml' into xctest-subspcec-tests
[XCTEST] Add XCTest tests to Travis.
Merge pull request #3 from modocache/xctest-subspec-tests

[XCTEST] Add automated tests for KIWI_XCTEST macro.