Merge pull request #10 from textmate/master

Adds visibility attribute.
Fixed a problem causing initialKeyView to not work

Fixed a problem causing the 'initialKeyView' method to not work when first appearance of content view of window.
Merge pull request #12 from eldenchen/master

The 'initialKeyView' method did not work correctly.
Returns back initial first responder logic.

https://github.com/shpakovski/MASPreferences/commit/8f3de32e412026989f66234b46a2be2aedb724a7#commitcomment-1990777
If the first view controller is NSNull, the selected view controller is set correctly on first launch.
Merge pull request #13 from jnorth/master

If the first view controller is NSNull, the selected view controller is incorrectly set on first launch.
Fixing goNextTab: and goPreviousTab: methods for [NSNull null].
Merge branch 'master' of github.com:shpakovski/MASPreferences
Support compiling with ARC under Clang using ifdefs.
Merge pull request #17 from alexstaubo/master

Support compiling with ARC under Clang using ifdefs.