list_pop_communities, list_subscribers and normalize_post readme files added

hivemind/tavern/bridge_api_patterns/list_pop_communities/_readme.txt

+Lists communities by new subscriber count. Returns names and titles community list.
+
+method: "bridge.list_pop_communities"
+params:
+{
+  "limit":"{number}",
+
+    optional, range 1..25; default = 25;
+
+}
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hivemind/tavern/bridge_api_patterns/list_subscribers/_readme.txt

+Lists all subscribers with role, title and time of subscription for given community.
+
+method: "bridge.list_subscribers"
+params:
+{
+  "community":"{name}",
+
+    mandatory, points to community;
+
+}
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hivemind/tavern/bridge_api_patterns/normalize_post/_readme.txt

+Took post object and outputs bridge-api normalized version, but at the moment there is no fat node that would be source of unnormalized posts.
+Result is basically the same as bridge.get_post.
+Depracated.
+
+method: "bridge.normalize_post"
+params:
+{
+  "post": {
+
+    "author":"{author}" + "permlink::"{permlink}",
+
+       mandatory, point to valid post; rest of parameters are irrelevant
+
+  }
+}
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