Close the connection at content_length_limit if the server lied or didn't send Content-length.

CVE-2013-4585

Signed-off-by: Corey Donohoe <atmos@atmos.org>
reintroduce blacklist ips with dns support

From Kevin Mehall <km@kevinmehall.net>

This is a partial revert of 5f9e0d8466c3 and based on
Andrew Brampton's patch at https://github.com/atmos/camo/pull/19
version bump to 1.3.0
Merge pull request #34 from atmos/patches-from-kevin

Patches from Kevin