Merge pull request #11 from Thu-SaaS-CloudComputing/fix/category-tree

Fix/category tree
merge for writing cucumber
Merge branch 'feature/authentification' of github.com:Thu-SaaS-CloudComputing/CloudComputing
Merge branch 'master' of github.com:Thu-SaaS-CloudComputing/CloudComputing
Merge branch 'feature/authentification' of github.com:Thu-SaaS-CloudComputing/CloudComputing into feature/authentification
doing cucumber with some corrections in migration and seed