added controller to allow manage pairwise suggestions
added more tests for pairwise classes
added links between pairiwse results and suggestions pages
changed pairwise choices management page size to 20 and fixed pairwise_content_test
some improvements to pairwise choices management views
Merge branch 'stable' of gitlab.com:participa/noosfero into stable
Merge branch 'AI2942-pairwise_plugin' into stable