added standard redis key name constants

lib/redistat.rb

@@ -12,6 +12,11 @@ require "redistat/label"
 require "redistat/date"
 
 module Redistat
+  
+  KEY_NEXT_EVENT_ID = "Redistat.next_event_id"
+  KEY_EVENT_PREFIX = "Redistat.event:"
+  KEY_LEBELS_PREFIX = "Redistat.lables:"
+  KEY_EVENT_IDS_SUFFIX = ".event_ids"
 
   # Provides access to the Redis database. This is shared accross all models and instances.
   def redis

lib/redistat/label.rb

@@ -11,7 +11,7 @@ module Redistat
     end
     
     def save
-      @saved = (db.set("Redistat:lables:#{@hash}", @name) == "OK")
+      @saved = (db.set("#{KEY_LEBELS_PREFIX}#{@hash}", @name) == "OK")
       self
     end