Refactor Spritesheet and BitmapText loader middleware (#4400)
                
                  
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                  * Removes application loader from loaders
* Decouples spritesheet and bitmap text middleware from loaders
* Fixes documentation, adds deprecated methods to bundle
* Fixes notes about docs, consistency
* Fixes linting
                
                  
                  
                    Matt Karl
                    authored 
  
    
      on 8 Nov 2017
    
  
                    
                  
                  GitHub
                  committed 
  
    
      on 8 Nov 2017