Update placeholder of published data in editor

fixes #1351

- when a post has a published_at value show a blank
placeholder

- when a post doesn’t have a published_at
value then show the required published at value
format
Merge pull request #1888 from hswolff/additional-ux

Update placeholder of published data in editor
Shims for deleted (refactored away) files

closes #1873.
During file system merge upgrades of new releases, old files are not removed and node's require loads the old file instead of all the new ones in the new directory. The files in this commit act as a delegate for all other dependent scripts. These shim files explicitly require the new index.js.
Merge pull request #1883 from mattflo/master

Restored files that were refactored away.
Merge pull request #1894 from ErisDS/issue-1558

Notifications can be dismissed with ESC
Bump version for pre-release 2
Updating to latest Casper
Removing changelog from release

- this isn't required on account of GitHub & it being ENORMOUS
HTTP Endpoint for image uploads

Conflicts:
	package.json
No first run message
Add theme check

Conflicts:
	core/client/helpers/index.js