Add an HTML structure to select the newsletter type
Pull newsletter types from the taxonomy to display buttons

These buttons will be used to setup the newsletter type for batch loading of common items.
Enqueue scripting for newsletter management in the proper admin screens
Enqueue the script in the footer
Prepare our ajax request with the newsletter type

The response will need to be used to fill out other options. In the case of announcements, we'll likely just grab a list of available announcements for filling everything in. In the case of news, we'll need to offer quite a bit more.
Handle ajax callback to set the newsletter type
Account for the display of returned items from our ajax call
Setup a method to return an announcements ajax response
Implement initial query for building announcement data

Pass back titles as a JSON object. We'll add some other data from the announcements in the next update.
Return more complete item information in the json response
Introduce an initial display for returned newsletter items
Add an identifier to the newsletter item
Start adding style to the newsletter as it is built

We won't want to try and duplicate the inline styles that will be in the actual HTML email template, but we should do a good enough job of matching things in the meantime.
Use a timestamp based on our timezone rather than server time

This follows the install of WordPress rather than setting a manual offset in
Style out the newsletter build a bit to match our front end template