Model and controller spec files pass.

Views are another matter (and will explode badly at this point)
Tests for views/posts now work.

Not going to make any claims for other views though!  About to test them
next.
All spec tests now pass with s/update/post

Haven't done a full runthrough of the site yet, so will probably need to
make a few more changes.
s/update/post in members controller, plus tests
s/update/post in routing. I think this is it!
Added some basic tests for RSS feeds.
s/users/members/g -- models and tests for them
s/users/members/g -- controllers and their tests
s/users/members/g -- all tests pass

There's still probably stuff broken, but this seemed like a good spot to
commit.  Sorry for the enormous chunk of code.  I was attempting to
update the views, but found that I needed to update a few things
elsewhere as well to make them work.
Rearranged routes so that devise worked with "members"
renamed Member.username to login_name
renamed Post.member_id to Post.author
Changed garden.member_id to garden.owner_id
Renamed default garden in /spec/factory/garden

"My Garden" was too generic and hard to test for -- tests like
rendered.should contain "Garden" are far too easy to have a false
positive pass.  So I renamed it "Springfield Community Garden" so that
false-positive passes were less likely.
Fixed up tests for garden display

These were just wrong wrongety wrong. I think they were from before we
were auto-creating a garden for new members.  Fixed now.
FGified the login_member method
Fixed reference to User in db/seeds.rb
Remove broken migrations

It seems these should never have been migrations in the first place.
It's considered an anti-pattern to include model code in your migrations
(these referred to User and Update), and we can see why -- having
renamed the models, these migrations now fail.

Apparently the Right Thing is to write a rake task to do the work in
question, and then run it via whatever deployment mechanism you use.
Since these have already been run on our dev server, and they're not all
that important anyway (i.e. won't break people's local machines they're
developing on, etc), and on top of all that they're a couple of months
old so most active developers should have run them already... as I was
saying, considering all that, I'm just blowing them away.
Merge pull request #87 from Skud/user2member

Rename "user" to "member" throughout codebase