Create task view

This is for #6.

Summary of changes:
- add a `CreateTaskView` in `apps/project/views.py` that creates new tasks with hard-coded selections.
- add a template for task creation in `templates/project/task_create.html`
- add url to `apps/project/urls.py` for task creation
- add `get_absolute_url()` to Task model so we have somewhere to go after making a task, along with view and url

Once we merge these in, you can go to: `/project/1/task/create/` to create a new task.
After you fill out the form, it will redirect you to a page to view info about that task.