Create stored procedures/functions in LineByLine execution mode

Recently I got into a situation where it was required to version control migration (using mybatis migrations) of stored procedures along with other scripts (a lot) containing both DDL and DML statements. 

Unfortunately, when "send_full_script" was enabled, it worked for the script with stored procedure, but failed other scripts with the same exception mentioned in https://code.google.com/p/mybatis/issues/detail?id=582

This modification in ScriptRunner facilitates the creation of stored procedures & functions with "send_full_script" disabled.

Please review and let me know if this is worthy to be included in a future release. Thanks!