add delete route for organization_project_member
add scope member to user_project
add model,controller, and view for destroying member of a project
add messages for destroying member from a project
specs for destroying memeber from project
Made some change pointed in review
put some duplicates together outside of CREATE and DELETE
Merge pull request #85 from root04/saorister/destroy_project_member

プロジェクトからメンバーを削除