Improve specs2-embedmongo

I make a lot of changes, because my main problem was that i run the tests with sequentials and it doesn't work. I look in the code and i found that it stops mongo in the after method but the after method is executed after each Fragment ( It's like the equivalent to @Before of JUnit and not the equivalent of the @BeforeClass ). The close equivalent to this what they say here http://etorreborre.github.io/specs2/guide/org.specs2.guide.Structure.html -> Global setup/teardown.

Other changes are:

- Update all the dependancies
- Add the Eclipse plugin
- Update the mongodb default version
- Clean the DB after each fragment