Spring core started to have cglib dependency by default

Due to: https://jira.springsource.org/browse/SPR-9669
Spring Core is going to be have by default cglib library dependancy, as it is commited into the 3.2 branch.

The efect of this change is eliminating the need to manually add CGLIB to the application classpath, what is needed for using Java-based configuration functionality and proxy-target-class and method injection. Those things will work out of box.

All of this will work from the next released version.