title: Merging Two ObservableCollections
body: <p>I have two Observable Collections that I need to merge into one collection.</p>
  
  <p>This arises because I have two methods, getTasks(staffID) which returns an ObservableCollection and getTasks(teamID) which selects the staff and pulls back the staff tasks.</p>
  
  <p>For the teams I will have multiple small observableCollections, I just want to merge them.</p>