(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

- removed unneeded Spring config files
- moved i18n files to a dedicated folder

- 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

With thanks to Rob Winch for patch submission.

+ removed unused script

+ improve mysql script to prevent data from being added if it's already present

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

+ improve DataSource setup

+ improve DataSource setup

+ moved db files around
+ moved JPA/AOP META-INF/ files into the webapp classpath 

+ move jdbc scripts from META-INF into /resources

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