Creates a new feature branch as a direct child of the current branch.
Syncs the current branch, forks a new feature branch with the given name off the current branch, makes the new branch a child of the current branch, pushes the new feature branch to the remote repository (if and only if new-branch-push-flag is true), and brings over all uncommitted changes to the new feature branch.
See sync for information regarding remote upstream.
git town append <branch>