[core] Add NIImageUtilities.
[core] Add NIButtonUtilities.
[core] Fix typo in the docs.
[core] Fix more typos.
[core] Add NIEdgeInsetsOutsetRect.
[core] Add NIIsPhone.
[core] Flip order of parameters in NIEdgeInsetsOutsetRect.
[core] Add NICenter methods for centering views.
[core] Add NIIsLandscapePhoneOrientation.
Merge remote-tracking branch 'upstream/master'