Rename _quote to quote

Related to #978

Author: yahonda

lib/active_record/connection_adapters/oracle_enhanced/quoting.rb

@@ -74,7 +74,7 @@ def quote_string(s) # :nodoc:
           s.gsub(/'/, "''")
         end
 
-        def _quote(value) # :nodoc:
+        def quote(value) # :nodoc:
           case value
           when Type::OracleEnhanced::CharacterString::Data then
             "'#{quote_string(value.to_s)}'"