Include table name information to missing index exception

Sometimes it can be too difficult to figure it out which table needs adding an index, so I suggest to add a table name to exception message so developers can easily figure it out what's going on.

Screenshot:
![action controller_ exception caught-1](https://cloud.githubusercontent.com/assets/482566/2645981/8deaf87a-bf38-11e3-8cb9-dcc25300feec.png)