Installed JMSDiExtraBundle
Created CheckCategory constraint

This constraint checks that category is selected in new transaction form when required.

A category is required in the following situations:
* Type is expense and account is on-budget
* Type is transfer, account is on-budget and transfer account is off-budget
Created more validators for LineItem
Added validation for payee and payer
Removed Default controller and index page.

Going to move this over to a separate bundle.
Created some pages, including tutorials section
Created first chapter of tutorial for Budget Banana