Support windows for GET response matching

Based on the work by @hungrydavid this allows to match GET parameters via the
same mechanism as is used for the POST response body matching.

This finally allows for full windows support because ? and & are no longer
required in the filenames to match the GET request Parameters.

@hungrydavid do you mind reviewing this?
Depending on how strictly you want to enforce no semi-colons, you should need one for a break statement. 
Totally up to you though, just commenting :)