NvaigationBar title replaces TabBarItem item on iOS

[nfcampos]

ie. if they're different, when you visit the tab, the tab bar item title changes.

this issue is described here http://stackoverflow.com/questions/21615637/how-to-change-uiviewcontroller-title-independent-of-tabbar-item-title

I'm happy to fix this, do you guys have any preference between any of the hacky solutions proposed in that stack overflow link? ;)