Class renaming for content_negotiation
Splitted SERVER_CONTENT_NEGOTIATION in 4 differents classes for each kind of negotiation
Changed to use ITERABLE over LIST for supported variants arguments
Factorized some code for http parameter parsing such as q=1.0;note="blabla"  and so on
Integrated within EWF
Updated README.md for conneg
Using the new Content Negotiation library to implement WSF_REQUEST.is_content_type_accepted