Introduce ExtDirectSpring dependencies

Using the ExtDirect implementation for Java/Spring from https://github.com/ralscha/extdirectspring. Further implementations will follow in the next commits.
Add missing person- and user-services.
Add Model-annotations to all current models.

The Model annotation will be used by the extclassgenerator library to generate appropriate EXT-models.
Add a ExtModelController, that provides Ext models

The generated Ext models are based on the Java models and will be generated by using the extclassgenerator framework.
Add missing person- and user dao.
Adapt the webapp-archetype to use ExtDirectSpring
Merge pull request #30 from buehner/ext-direct-spring

Introduce ExtDirectSpring