Only send position update during playback rather than the whole lot (bad copy/paste)
Allow to define an image notification with a URL or file path
Update description of osx-packager-qtsdk
Add new myth notification constructors

Allow to create a simpler notification, using strings only (title and author)
Add display of notifications stack.

Notifications will now be displayed on top of each other as a queue.
Non-registered notifications will be displayed for 5s minimum or per the duration requested.

Not themeable, no animations per say; all hard-coded for the time being.
Add optional argument to MythNotification constructor: details
Add notification for client connection/disconnection
Add notification for client connection/disconnection
Move creation of notification center so it will be last in screen stack.