see https://jira.springsource.org/browse/DATAJPA-292

(feedback from Oliver Gierke)

renamed profiles and removed unnecessary@DirtiesContext annotation so the Test suite now runs in 40% less time

- there are now 3 data access implementations (jdbc, jpa and
spring-data-jpa)
- added corresponding bean profiles
- JUnit tests are now successful

There is still some polish up to be done.

- migrated to bean validation annotations
- merged to one single controller

- added JPA annotations to POJO classes
- merged JPA Repos with Hibernate repos so we only use JPA
- renamed .txt files to .sql
- moved Spring configuration files so it is easier to use them inside
JUnit tests

+ move spring application context files under a dedicated folder (to prevent JBoss XML parser from choking)
http://forum.springsource.org/showthread.php?t=68949

+ renamed META-INF/persistence.xml to META-INF/jpa-persistence.xml since JBoss will scan it automatically
and complain about non-jta-resources declared.

+ fixed tab/spaces consistency

+ extracted datasource definition into a separate file to eliminate redundancy
+ introduce jdbc: namespace

+ added on the fly db configuration to all contexts
+ removed schema numbers to always pick the latest version

SPR-6448
+ commit the gross of the files
+ added maven pom