pom:xml: use <dependencyManagement> to force versions of spring-core, spring-context and spring-beans to 3.2.x. instead of exclusions on spring-data-jpa dependency because Maven sometimes pulls both versions 3.2.x and 3.1.x versions of coring-core, spring-beans and spring-context.

App should be as simple as possible for beginners

Update BaseEntity.java

Introduce a "jee" Spring profile to retrieve the datasource with a JNDI lookup

This fix the following error :

   "setAttribute: Non-serializable attribute owner"

In the following context :

  - hsql database configuration (updating data-access.properties only)

  - mvn clean install bees:run (cloudbees local run)

Allow to override data-access.properties with System Properties

Add intellj project files to .gitignore

- test didn't have the suffix "Tests" so it was not taken into account
when running Maven in the comand line

- test didn't have the suffix "Tests" so it was not taken into account
when running Maven in the comand line
- the POM was not configured so it can find Spring config files placed
inside src/test/java

Added a select Tag to validate pet type