Add shortcut script for watching sass.
Added text to send to invitees.

Display text in LetterOpener. Redirect InviteController to
/fedops screen instead of to the same page.
Added checks in IntegrationTest to check send emails.
Added flash message to support feedback to end user.
Added ability to close flash message.
Refactored InviteController into smaller objects.

InviteDao is responsible for persiting the invitation in the
database.
InviteService is the one who persist and sends the email to the
invitees.