Update tutorials and add Junit tests (WIP)

.gitignore

...ed/adjustment/InterSensorsOptimizationProblemBuilder.java

src/main/java/org/orekit/rugged/api/Rugged.java

src/test/java/org/orekit/rugged/api/RuggedTest.java

src/test/java/org/orekit/rugged/utils/RefiningTest.java

.../java/fr/cs/examples/refiningPleiades/GroundRefining.java

...s/java/fr/cs/examples/refiningPleiades/InterRefining.java

...efiningPleiades/generators/InterMeasurementGenerator.java

...va/fr/cs/examples/refiningPleiades/models/OrbitModel.java