Add couchbase with modifications, formalize broadcaster and make testable and some other stuff

lib/qwaiter/counter.rb

@@ -0,0 +1,27 @@
+module Qwaiter
+  module Counter
+    mattr_accessor :connection
+
+    # mainly for testing purposes
+    def self.set(key, value)
+      connection.set(key, value)
+    end
+
+    def self.get(key)
+      connection.get(key).to_i
+    end
+
+    def self.incr(*args)
+      connection.incr(*args)
+    end
+
+    def self.decr(*args)
+      connection.decr(*args)
+    end
+  end
+end
+
+# use the connection from couchbase-structures/documents
+# will be overwritten in the specs since flushing the real 
+# thing is difficult
+Qwaiter::Counter.connection = $cb