Features for Minimum Viable Product for T130924

• Notification will be triggered when
  1. Page is created or edited
  2. Template field or value of template field is changed

• The extension would track
  1. All pages
  2. Pages in namespace(s) or categories
  3. List of pages

• Whom to be notified
  1. User in a user group or predefined list
  2. Email id of a non MediaWiki user

• The extension would use
  1. Echo extension
  2. Email notification
  3. Special page with recent changes
  4. Hooks to call other extension(s)