FGified user model tests
FGified views/members/index

Note that all users need different email addresses otherwise you get
"email address is already taken" problems if you try to create two at
once.
This doesn't need a confirmed user, just a basic one.
FGified and generally improved members/show tests
FGified and slightly improved updates tests
FGified garden tests. Removed some spurious bits.
Turned a contains into an assert_select. This is better.
FGified view/plantings tests
FGified models/planting tests
FGified models/garden tests.

Also tweaked slug generation to be lowercase, and avoid spaces in slugs.
This probably needs more work to handle unusual characters, but I
punted on that for now.
Made the :user factory be confirmed by default.

We hardly ever actually need an unconfirmed user, but if we do, there is
now :unconfirmed_user for that purpose.
FGified model/update tests
Merge pull request #85 from Skud/fg2

Moar factory girl