Fix regression with meta object revision checking

Fix regression with meta object revision checking

Commit 00a07bcbd7a592072822b0e55ab2e75e90c3f9f5 replaced the CheckRevision
parameter on the call GetProperty on the scope QObject with a get that
would do IgnoreRevision.

This adds a property getter on the QV4::QObjectWrapper that allows for checking
the meta object revision. The plan is to move all of the property getter code
from QV8QObjectWrapper into QV4::QObjectWrapper incrementally.

Change-Id: I8e5a93ce3351a8c5dba13f14cd43e4036875b792
Reviewed-by: Lars Knoll <lars.knoll@digia.com>