Merge branch 'project_indra' into 'staging'

...deadliners/appuser/controller/RegistrationController.java

...om/id/ui/cs/deadliners/appuser/model/appuser/AppUser.java

...ers/appuser/security/configuration/WebSecurityConfig.java

...deadliners/projects/controller/JoinProjectController.java

...cs/deadliners/projects/controller/ProjectsController.java

.../java/com/id/ui/cs/deadliners/projects/model/Project.java

...deadliners/projects/model/request/JoinProjectRequest.java

.../cs/deadliners/projects/model/request/ProjectRequest.java

...id/ui/cs/deadliners/projects/model/response/Response.java

.../id/ui/cs/deadliners/projects/service/ProjectService.java

...ui/cs/deadliners/projects/service/ProjectServiceImpl.java

src/main/resources/static/css/project-page/project_page.css

src/main/resources/templates/appuser/signup.html

src/main/resources/templates/mainpage.html

src/main/resources/templates/project-page/detail_forum.html

src/main/resources/templates/project-page/form_forum.html

src/main/resources/templates/project-page/form_link.html

...n/resources/templates/project-page/form_task_project.html

src/main/resources/templates/project-page/project_page.html

src/main/resources/templates/projects/new_project_form.html