Now using aspectj with spring aop

The project now uses spring-aop with aspectj
Delete unused files

HibernateConfiguration and log4j.properties in test context will not be
used anymore - deleted
Add the first aspect class to project
Create test.pdf for use in DAOs

To test persistece of document streams inside the DAOs we will use this
test pdf
Rename DocumentContainer getter/setter
Use junit assert instead of Assert class from springframework
Adding commons-io dependency
current impl