add note on profile edit page after first log in that is optional

[ngehlenborg]

When users log in the first time they should be shown the "Edit Profile" page but there should be a note that filling out the profile is optional and a link to the homepage should be included in that message.

Pivotal Tracker story 40900179 (Nils Gehlenborg - Dec 9, 2012)

[psm3426]

Commit by Psalm Haseley
b495bdf

[Fixes #40900179]
There is a message on the userprofile edit page the first time

[Fixes #40877835]
added a dispatch_uid so emails only get sent once (Psalm Haseley - Dec 11, 2012)