fix most recent post stolen by the last logged in user AND only show active users in post-settings-menu drop-down

fixes #3549 fixes #3528
- instead of grabbing and setting the author after fetching the list of users, get the author info from the models "author" property and set it when that value returns. (3549)
- added filter to the PSM's "authors" attribute to only display active users (3528)
Merge pull request #3569 from morficus/issue-3549

fix most recent post stolen by the last logged in user AND only show active users in post-settings-menu drop-down
Add classes to settings headers

No issue

Refs https://github.com/TryGhost/Ghost-UI/issues/91

- Adds a class to settings page headers, for cleaner CSS selectors
Working delete user modal & button

closes #3529
- Created ‘delete user’ modal (similar to the ‘delete post’ modal) and
controller
-  Modal will be opened if ‘Delete User’ is selected in the user
setting cog menu
Update to release process

- Release does all init & prod tasks necessary to create a full build
- Don't create or include .map files
- Don't include pre-minified prod files
- Don't include export .json files
- Don't include client/html
Merge pull request #3588 from felixrieseberg/iss3529

Working delete user modal & button
Merge pull request #3587 from PaulAdamDavis/settings-header-classes

Add classes to settings headers