Improvement/servicemix 5

This pull request introduce four major upgrades to our system:

* Servicemix 5.0 (instead of 4.5.2)
  * Spring 3.2.4 (instead of 3.0.7)
  * Spring Security 3.1.5 (instead of 3.0.8)
* PaxExam 3.4.0 (instead of 2.3.1)
  * Junit 4.11 (instead of 4.10)

Here's a short list of what this changed implied:

### Servicemix 5

- Upgrade Spring was required.
- There's no longer different distributions for Windows and Linux versions. Servicemix can only be downloaded as a zip, containing scripts for both O.S.
- Karaf 2.3.4 introduces Apache Aries 1.0.1. There's a bug not solved yet which could be skipped via a work-around (comments on features.xml of opennaas.core).
- Property-placeholder must contain a default property value in order to avoid service registration and unregistration on startup.
- We can delay the CLI prompt, so the user can't write any command until all bundles are started :)

### Spring / Spring security

- Some depracated classes and attributes were modified. Update was trivial.

### Junit 

- Classes of package junit.framework are depracated, so they were replaced by the ones offered in org.junit 
- There was a problem with the @BeforeClass annotation and the static attributed initialized in them. After studying viability, they were replaced by @Before  annotation.

### Pax-Exam

- New Karaf-container provided by PaxExam, replacing and deprecating the one provided by openengsb.labs
- Upgrade from junit 4.10 to 4.11 was required.
- Modify all integration tests with new semantic.


In following pull requests, more libraries would be upgraded.

Finally, a new option had to be added to itests, since the karaf.delay.shell option and pax-exam doesn't look to be very close friends...