+ guide/pipes/ts: update docs and example code + guide/pipes/dart: new prose, updated example code + fix platform_directives reference; html cleanup + enable pipes e2e testing For `e2e-spec.js`: If the async test is executed too early it will fail (simply because the async message hasn’t been received yet). + follow new constants naming convention
		
			
				
	
	
		
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| extends ../../../ts/latest/guide/pipes.jade
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| 
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| block includes
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|   include ../_util-fns
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| 
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| block pure-change
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|   :marked
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|     Angular executes a *pure pipe* only when it detects a *pure change* to the input value.
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|     In Angular Dart, a *pure change* results only from a change in object reference 
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|     (given that [everything is an object in Dart](https://www.dartlang.org/docs/dart-up-and-running/ch02.html#important-concepts)).
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| 
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