Commits on May 20, 2016

1. Implement trait-based ResourceThreads and clean up related naming issues …

   Changes include:
   
   - Introduce an IpcSend trait to abstract over a collection of IpcSenders
   - Implement ResourceThreads collection to abstract the resource-related
     sub threads across the component
   - Rename original ResourceThread and ControlMsg into an unifed CoreResource__
     to accommodate above changes and avoid confusions

   

   izgzhen committed May 20, 2016

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