Closes#3402, Closes#3428
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### Components
- Added GhostSelectComponent to handle async select creation (h/t @rwjblue)
- Added GhostRolesSelector (extends GhostSelect) for displaying user role options
- Created StoreInjector for surgically inserting the store into things that normally wouldn't have them.
### Users Settings
- InviteNewUserModal now uses GhostRolesSelector & defaults to Author
- The role dropdown for user settings has permissions set per 3402
### User Model
- Added `role` property as an interface to getting and setting `roles`
- Refactored anything that set `roles` to set `role`
- isAdmin, isAuthor, isOwner and isEditor are all keyed off of `role` now
### Tests
- Added functional tests for Settings.Users
- updated settings.users and settings.users.user screens
- fix spacing on screens
### Server Fixtures
- Fixed owner fixture's roles
no issue
- added `invited-pending` when resending invitation
- promise chain was missing a return statement
- email error was masked and front end showed success notification
Closes#3083 Refs #3229
- Populates the dropdown list in the invite user menu with the
list of roles a user is permitted to create.
- Users API now checks the invite user request for allowed roles.
- Change API response from 200 to 201 on successful invitation.
- Change API response from 500 to 201 when the user was created but
the email was not sent. The client will show a warning notification
when it sees 'invite-pending' as the new user's status.
- Add support for "?status=all" to the /users endpoint.
- Refactor the route and controller for the /settings/users page so
that there's only one network API call to load users instead of two.
closes#3309, refs #3229
- adds different message depending on status
- doesn't delete the new user if the problem was an email error
- filters the 2 lists based on all statuses
Closes#3246
- Add a UserValidator to the validation engine that runs a set
of validations based on the user status.
- Added validations for invited users and active users.
Closes#3079
- new controller and template for invite-new-user-modal
- actually triggers email invite via POST /ghost/api/v0.1/users/
- setting default language value (on the client) when creating a user
- only available role is "Author" - pending 3196
- updates to UsersIndexController to allow dynamic property calculation and template rending