Merge pull request #1 from adaussy/master

Test on preferences 1
Update tests.
Add new DefaultPreferenceContext to all tests (except prefs tests)
Merge pull request #2 from adaussy/master

New tests: Post processors preference page
Update tests.
Update pom.xml with new maven.obeo.fr repository
Correction of test ts001_tc004

The order of the differences has changed so the test should browse the
differences in a different order.
Correct ts016_tc002_match_engine_configuration_* tests.

Order of differences has changed.
Correction test ts016_tc012_groups_preference_page_set_defaut_group.

Initialization error.