Created Dynamic filtering: default-deny: useful rulesets (markdown)

Dynamic-filtering:-default-deny:-useful-rulesets.md

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+##### economist.com
+
+    www.economist.com static-economist.com * noop
+
+##### github.com
+
+    github.com avatars0.githubusercontent.com * noop
+    github.com avatars1.githubusercontent.com * noop
+    github.com avatars2.githubusercontent.com * noop
+    github.com avatars3.githubusercontent.com * noop
+    github.com camo.githubusercontent.com * noop
+    github.com raw.githubusercontent.com * noop
+    github.com render.githubusercontent.com * noop
+
+##### mozilla.org
+
+    mozilla.org mozilla.net * noop
+
+##### reddit.com
+
+    reddit.com redditmedia.com * noop
+    reddit.com redditstatic.com * noop
+
+##### stackoverflow.com
+
+    stackoverflow.com sstatic.net * noop
+
+##### twitch.tv
+
+    twitch.tv jtvnw.net * noop
+    twitch.tv swiftype.com * noop
+    twitch.tv ttvnw.net * noop
+
+##### youtube.com
+
+    youtube.com content.googleapis.com * noop
+    youtube.com ggpht.com * noop
+    youtube.com google.com * noop
+    youtube.com googleusercontent.com * noop
+    youtube.com googlevideo.com * noop
+    youtube.com gstatic.com * noop
+    youtube.com plus.googleapis.com * noop
+    youtube.com youtube-nocookie.com * noop
+    youtube.com ytimg.com * noop