Fix friending in seedfile.
Add friendships relationship to User model.  Fix seedfile friendships.
Add friending functionality on index page.  Creates two reciprocal friendship entries.
Update Friending functionality.  User show has list of friends and can remove friends.
Change user show to differentiate Friends and Friended-by.
Add simple search for users on index.  Make sure current user is only one who can remove friends.
Add extra items to nav bar for login & logout.
Make sure signed-in user can only create weigh-ins for their own profile.
Add ability to add a friend from that users profile page.
Merge pull request #10 from GeneChatham/friendships

Basic Friendships added.
Merge branch 'cooper' of https://github.com/GeneChatham/weightable into cooper
Edit comment controller, comment partial and user show to work for adding comments. Need to add view of comments to show page.
Add logic to show all comments per weigh-in. Not yet working.