support multiple GET responses per file

Since windows does not support special characters in the file names this
allows for all responses to a certian get request to be in one file and
distinquished like POST responses would be split by new lines and header
lines.

fixes #19
update README
add deprecation notice for "old" GET matching
fix version

This is semantic versioning you know....
remove unneeded semicolon
clean up selectedResponse code

and make the missing test pass
Merge pull request #41 from sideshowcoder/multiple-get-responses

Support windows for GET response matching