Add some events notifications

Registered by huangtianhua on 2015-06-18

Now heat just send two notifications for stack action and autoscaling goup scale events, I think we should add some events notifications, such as:
1. stack's snapshot deleting
2. some stack-resources events, such as instance group resize, resource group resize

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Drafter:
huangtianhua
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huangtianhua
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