release pasteboard items et al since MMTabPasteboardItem retains UI objects

MMTabPasteboardItem retains the MMTabBarView (sourceTabBar) which
prevents the object from being released. Since the MMTabBarView also
retains the NSTabView and any NSTabViewItems this quickly locks up a
number of other objects such that when the window is closed these still
remain.
Update of DemoWindow.xib

Set DemoWindowController as delegate of Demo Window
Update of MMTabDragAssistant

-dealloc now releases _pasteboard item if still around.
-_dragAttachedTabBarButton: ofTabBarView: at: event: source: now
invalidates stored _pasteboard item if not continuing with detached
drag. This method now creates the pasteboard item (had been created by
calling method)
Revert "release pasteboard items et al since MMTabPasteboardItem retains UI objects"

This reverts commit f343b9cc97d631f34be4dde3c7c296f23132f409.
Better solution to the pasteboard hanging on to UI objects
merge upstream changes
Update of MMAttachedTabBarButtonCell

Added missing override of NSCopying/NSCoding stuff
Update of MMRolloverButtonCell

-copyWithZone no longer uses property driven access
MMTabBarButtonCell

Missing NSCopying/NSCoding support added
Update of tab styles

-dealloc now correctly invalidates instance variables
Update of NSTabViewItem+MMTabBarViewExtensions

new property: 'showObjectCount'
Update of MMTabBarView

binding of showObjectCount property added
Update of MMTabBarButton

No longer overrides -bind: toObject: withKeyPath: options:
Using the standard NSAutounbinder mechanism instead to avoid retain
cycles
Update of Demo project

added support of showObjectCount property
Merge pull request #9 from nivekkagicom/master

Merged. Sorry for the delay. Thank you!
Update of MMTabBarView

Rollover button hover state issue resolved
Update of MMTabBarController

Now releases overflow menu in -dealloc
Update of MMTabBarView.m

Fixed _updateOverflowPopUpButton
default.xccheckout added

Xcode's 5 default.xccheckout added
Update of MMTabBarController

just deactivated an NSLog