add link to user profile in home page

[bjmckenz]

Testing:

• log in.
• verify that clicking the button goes to "your" profile page. (/users/user/id=)

(particularly useful in testing messages/notifications)

[bjmckenz]

Testing:

• from /student and /schooladmin (NOT /professor), hit the Profile button on the left tab bar
• You can edit from there too.

[liannadevries09]

Reviewed and working