added method promote members #284
added isCreator part #284
removed unneeded files #284
added spec files # 284
added utf8 in all models and controllers #284
done with rspec #284
modify the view #284
enhanced the index view #284
resolved merging conflicts
added css #284
resolved conflicts #284
Merge pull request #310 from yousraHazem/c2_Riham_group_promote_members

C2 riham group promote members