As a Project Admin, I can remove users from a project

https://projects.invisionapp.com/d/main#/console/12114617/295896867/preview

When I see a user avatar in the members group, I can hover over the avatar to see an "x" to remove the user.

When clicking the x, the user is removed from the project members group (if tasks are assigned to the user, they should default back to the project admins on the project).