Added example to help debugging EWF
This is mainly a kind of echo server .. that return the request information.
Avoid decoding PATH_INFO and PATH_TRANSLATED to follow CGI spec.
Fixed library location for http
Ensure that PATH_INFO and REQUEST_URI are following the CGI specifications:
- PATH_INFO is percent decoded but still utf-8 encoded,
  this is available via WGI.path_info and WSF_REQUEST.utf_8_path_info.
- Added WSF_REQUEST.percent_encoded_path_info
- and WSF_REQUEST.path_info remains the unicode value for PATH_INFO

Added cgi_variables: WGI_REQUEST_CGI_VARIABLES to have a simple and quick view on CGI variables
Added execution_variables to be able to iterate on execution variables.
Added PERCENT_ENCODER.percent_decoded_utf_8_string
Improved the WSF_DEBUG_HANDLER to provide more information thanks to WSF_DEBUG_INFORMATION object.
Improved the debug example, so that it outputs more information.
Fixed error introduced during refactorying on WSF_DEBUG_FILTER
Verbose mode for the WSF_DEBUG_HANDLER.
Fixed various issues related to unicode and CGI variables (assuming that CGI variables are utf-8 encoded, and sometime percent encoded).
Delayed computation of `value' and `name' from WSF_STRING.
Fixed computation of REQUEST_URI when the server does not provide it (this is rare, but possible).
   compute it as SERVER_NAME + encoded-PATH_INFO + {? + QUERY_STRING}
Various changes related to new WSF_DEBUG_INFORMATION and WSF_DEBUG_HANDLER.
Replace any multiple slash sequence by a single slash character for PATH_INFO.
Improved comment related to PATH_INFO and stripping multiple slashes sequence to single slash.
Merge branch 'fix_cgi_value' of github.com:jocelyn/EWF
Completed change on debug handler and filter, to use WSF_DEBUG_INFORMATION.