[Merge] lp:~gary-wzl77/qtorganizer5-eds/null_id_occurrenceitem into lp:qtorganizer5-eds

[Gary.Wang]

With this MR, Recurrence items will be null OrganizerItemId and it's parent keeps the same id(edsId).
This MR is to trigger modelChanged() when adding a recurrence items. Currently in ubuntu calendar apps, Creating a monthly/weekly/yearly events doesn't take effect(In face, recurrence items are saved in calendar.ics, after relaunching the app, we can see these new added items). The reason for this issue is we're not able to receive modelChanged signal from qdeclarativeorganizermodel.
 
qdeclarativeorganizermodel will check if the id for new recurrence items is null.
Currently since we set edsId for recurrence items, which fail to call emit modelChanged when adding new a recurrence event.    
http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/wily/qtpim-opensource-src/wily-proposed/view/head:/src/imports/organizer/qdeclarativeorganizermodel.cpp#L1523
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https://code.launchpad.net/~gary-wzl77/qtorganizer5-eds/null_id_occurrenceitem/+merge/278777
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