Fix for issue #81.
Each time a WYPopoverConrtoller is init, the static theme var is re-configured.
But since there is also an observer on the _theme var, the observer is invoked for every changed theme property during the init, which results in performing the -updateThemeUI method about 20 times in a row.
This PR introduce some crash. CF : issue #86.
You should set new theme only once using [self setTheme:theme] instead of _theme = theme to register observer correctly.
Fix for issue #81. Each time a WYPopoverConrtoller is init, the static theme var is re-configured. But since there is also an observer on the _theme var, the observer is invoked for every changed theme property during the init, which results in performing the -updateThemeUI method about 20 times in a row.