Add delete flag column to Users table
mended user edit view and user list view.
added function to

- disable user
- edit all user information(admin only)
- Changed Devise route from /users -> /d/users
- Removed unnecessary items(like email)
- removed unused files
Merge pull request #19 from xengineer/xengineer/change_account_edit_management

Xengineer/change account edit management