Added fetchers concept: seperate scripts to fetch the feeds

Fetchers claim to be a certain client. They try to send the same
headers as the original client. That's better than a simple curl request
with a fake user agent, because curl doesn't send the other headers like
the original client and therefore its traffic stands out.

fetcherslist

@@ -0,0 +1,2 @@
+fetchers/firefox
+fetchers/chrome