rsim/oracle-enhanced — pull request #200 by yahonda (2012-07-18 20:35:39+00:00)
Title: Clear index cache when any table is dropped

This pull request addresses a failure at the `test_create_join_table_with_index` reported in #199.

`indexes` method caches all indexes but not cleared when the table which has these indexes is dropped.
So, `indexes` method shows non-existent indexes just after the table is dropped.