Squashed 'XCDYouTubeKit Tests/VCRURLConnection/' content from commit 54bd4ae

git-subtree-dir: XCDYouTubeKit Tests/VCRURLConnection
git-subtree-split: 54bd4ae77a34108cb0f65a0fb4f16948e24703b0
Merge commit 'f07b28876a9f08f5e456eb0a690dc2a2600a2277' as 'XCDYouTubeKit Tests/VCRURLConnection'
Add VCRURLConnection to unit tests target
Integrate VCRURLConnection for offline unit tests
Speed up unit tests