Refactors the spritesheet, texture and bitmap font loaders (#3676)
                
                  
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                  * Refactors the spritesheet, texture and bitmap font loaders
* Fixes trailing space
* Addresses feedback in var caching and docs
* Adds unit test for Texture.fromLoader
* Adds new Spritesheet class
* Cleanup spritesheet destroy and imports
* Added baseTexture destroy to Spritesheet
                
                  
                  
                    Matt Karl
                    authored 
  
    
      on 1 Feb 2017
    
  
                    
                  
                  GitHub
                  committed 
  
    
      on 1 Feb 2017