Confirmations, Previews, and Event Emails (Oh My!)

Added various email centered things. Descriptions as follows:

- There is a new view for previewing the jobs email before it is sent from liquid
    - this view must be looked at before sending the jobs email
    - also has the option to send a test email to the currently logged in user
-  The weekly event email can now be sent directly from liquid!
   - there is a button to do this in the event email preview modal