minor, cleaning up after multiple query test
reverted adapter classes so they no longer split out the sql, instead the base does this and passes it over to the adapters seperately
moved test_execute_multiple_queries to BaseMigrationTest as its testing functionality of the Ruckusing_Migration_Base class
Added new method to split_query used by execute method, complete with test that it splits properly when semicolons exist inside strings. ref pull #120 and issue #123 on github