Add paranoia_{delete,destroy} aliases

This should help users be more explicit about what action they want to
perform. My hope is that this will also make it easier to migrate off of
paranoia.

lib/paranoia.rb

@@ -52,7 +52,7 @@ module Paranoia
     end
   end
 
-  def destroy
+  def paranoia_destroy
     transaction do
       run_callbacks(:destroy) do
         @_disable_counter_cache = deleted?
@@ -69,8 +69,9 @@ module Paranoia
       end
     end
   end
+  alias_method :destroy, :paranoia_destroy
 
-  def delete
+  def paranoia_delete
     raise ActiveRecord::ReadOnlyRecord, "#{self.class} is marked as readonly" if readonly?
     if persisted?
       # if a transaction exists, add the record so that after_commit
@@ -82,6 +83,7 @@ module Paranoia
     end
     self
   end
+  alias_method :delete, :paranoia_delete
 
   def restore!(opts = {})
     self.class.transaction do