GL 6.2 API addition remove project

https://github.com/gitlabhq/gitlabhq/blob/6-2-stable/doc/api/projects.md#remove-project
GL 6.2 API addition remove group

https://github.com/gitlabhq/gitlabhq/blob/6-2-stable/doc/api/groups.md#remove-group
Merge pull request #4 from sag47/feature/group_remove

GL 6.2 API addition remove group
Merge pull request #5 from sag47/feature/project_remove

GL 6.2 API addition remove project