Revert "Restore spam prevention"
Merge pull request #3307 from TryGhost/revert-3282-issue#3128

Revert "Restore spam prevention"
Adding and renaming permissions

refs #3283, refs #2739, refs #3096

- Renames permissions which didn't follow bread
- Adds permissions for notifications, mail and tags

Still todo:

- wire up the new permissions where they are needed
- add permissions for roles
New signup screen

See #3082 - This borrows setup screen styles for now
Fade in the setup form
Removing erroneous placeholder text from user profile

Reverting the placeholder that was introduced in #2734 to fix #1623. We should handle this intelligently by automatically interpretting the input and using validation if we can't. The user should not have to know or care about what http is.

Regardless off any of the above, we should not be introducing user-facing text like this without proper consideration. A placeholder of "http://ghost.org" is far more confusing than no placeholder at all. It also looks like a cheap promotional tactic on our part.
Merge pull request #3306 from JohnONolan/fadeinsetup

Fade in the setup form
Merge pull request #3308 from JohnONolan/newsignup

New signup screen
Merge pull request #3304 from JohnONolan/noplaceholder

Removing erroneous placeholder text from user profile
Merge pull request #3300 from ErisDS/issue-2739

Adding and renaming permissions