Call onInitialzed when component completed in case mozcontext initialized.

This way properties assigned from qml side to QuickMozView are
available when construction of the actual view starts.
[qtmozembed] Add OnWindowCloseRequested handler

windowCloseRequested is emitted when close is requested.
Use contentRects in touch update for drag start position.
Remove mRootFrameScrolling and handle scroll decorators from UpdateScrollArea

UpdateScrollArea is called from SendAsyncScrollDOMEvent which called
only for root frame.
Remove newWindowRequested
Merge pull request #64 from rainemak/mParentIdFix

Call onInitialzed when component completed in case mozcontext initialize...
Merge pull request #65 from rainemak/onWindowCloseRequested

[qtmozembed] Add OnWindowCloseRequested handler
Merge pull request #66 from rainemak/scrollUpdate

Scroll update
[qtmozembed] Add read and write parentId property

When multiple QuickMozView are created this it is good that
parentId can be read so that parent-child window relationships
can checked with this and uniqueID().
Merge pull request #68 from rainemak/parentIdReadable

[qtmozembed] Add read and write parentId property
[qtmozembed] Fix some multi-window issues. Merge remote-tracking branch 'origin/master'