EncoderDispatcher

• runs after its constituant encoders so it can
  • remove their mappings from the PEP line
  • add its own mapping with enough headers to encompase constituants and an extra to order them.
• adds no actual value above letting PEPAgent run them, but it will when I think of something cool

Example

Suppose you wish to employ the EscapeBody and SumBody PEP extensions.

before mapping:

PEP: {{map "http://a.com/EscapeBody.html" escape-12345}{strength must}}
{{map "http://a.com/SumBody.html" sum-12345}{strength must}}
escape-12345: gzipped
sum-12345: 0xac2138

after mapping:

PEP: {{map "http://a.com/EncoderDispatcher.html" encoder-12345 escape-12345 sum-12345}{strenght must}}
escape-12345: gzipped
sum-12345: 0xac2138
encoder-12345: "http://a.com/EscapeBody.html" escape-12345, 
               "http://a.com/SumBody.html" sum-12345