only warn about compatibility once, fix rakefile

Rakefile

@@ -1,9 +1,3 @@
-# def gemset_name
-#   ENV.fetch('GEM_HOME').split('@').last
-# end
-
-GEM_FILES = ReleaseOps.gem_files
-
 # need to releaase under both names until ZK is updated to use just 'zookeeper'
 GEM_NAMES = %w[zookeeper slyphon-zookeeper]
 

lib/zookeeper/compatibility.rb

@@ -1,4 +1,10 @@
-warn <<-EOS
+module Zookeeper
+  # @private
+  def self.warn_about_compatability_once!
+    return if @warned_about_compatibility
+    @warned_about_compatibility = true
+
+    warn <<-EOS
 
 -----------------------------------------------------------------------------
 
@@ -14,7 +20,15 @@
   is automatically required. This will *not* be the case in 1.1.
 
 -----------------------------------------------------------------------------
-EOS
+    EOS
+  end
+
+  def self.warned_about_compatability?
+    !!@warned_about_compatability
+  end
+end
+
+Zookeeper.warn_about_compatability_once!
 
 module Zookeeper
   module Compatibility