[Reviewer: Matt] Add headers to the HTTP compression profile

Adds HTTP headers to the HTTP compression profile. I have not bumped the resource bundle version as we are not using compression right now (though we should bump it when we enable compression). 

I have tested this by:

* Checking that sprout builds OK. 
* Feeding the dictionary into the sas-client UTs and checking they run successfully. 
* Checking in vim that the string matches the version in clearwater-sas-resources. 
Some of this looks a bit specific to the headers you pulled out.  For example, the Accept-Language and User-Agent strings.  Why's the nonce count always 2?  Why's the Content-Type always ISO-8859-1?  (Is this a more serious bug - are we not supporting UTF-8 somewhere?)