sub_organizations_plugin: Added cucumber tests.

(ActionItem2866)

Signed-off-by: Carlos Andre <carlos.andre.souza@msn.com>
Signed-off-by: Luiz Matos <luizff.matos@gmail.com>
Signed-off-by: Gabriela Navarro <navarro1703@gmail.com>
Merge branch 'AI2866-display_full' of https://github.com/fga-unb/noosfero into AI2866-display_full

Conflicts:
	plugins/sub_organizations/features/sub_organizations_display.feature