Consolidate Mail Notification

I'd like to add a new feature in Continuum to reduce email traffic by notifying once per group instead of for every project. Below is the Requirements.

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A. UI/Configuration

1. add a "Consolidate group notification" check box in the group level notifier page, which would flag Continuum to consolidate the notification

B. Notification

1. before the build starts, check whether the notification will be consolidated or not
2. if notification is to be consolidated,

• for one multi-module project in one project group:
  o aggregate build results at the end of the project group build
  o send notification containing the build results of the whole group
• for multiple multi-module projects in one project group:
  o build results will be aggregated per multi-module project
  o send notification after each multi-module project's build ends