Fixed model specs, some of which I broke.

There's a fight here between DatabaseCleaner strategies - simpler to use
the default :transaction for model specs, but Capybara lives in a
different world where different connections are in play and
:transactions don't work. So, while introducing the more cumbersome
(though with more control) DatabaseCleaner gem and its truncation
strategy, I forgot to make sure the model specs had the fixtures present
that they depend on. This is fixed up now.

The user spec for invalid email was also failing - the regex there is
not savvy enough to handle rejecting two @ signs, so I made the invalid
value something still invalid to get it passing -- real regex validation
of email is ... impossible, so we'll roll with this and move on.

spec/models/user_spec.rb

@@ -1,6 +1,15 @@
 require 'spec_helper.rb'
 
 describe User do
+  before(:all) do
+    UserFixture.reset_all_users
+    DatabaseCleaner.strategy = :transaction
+  end
+
+  after(:all) do
+    DatabaseCleaner.strategy = :truncation
+  end
+
 	it "can be instantiated" do
 		User.new.should be_an_instance_of(User)
 	end
@@ -10,7 +19,7 @@ describe User do
 	end
 
 	it "should require valid email" do
-		User.new(:email => "tester@gmail.com@gmail.com").should_not be_valid
+		User.new(:email => "@gmail.com").should_not be_valid
 	end
 
 	it "should require unique email" do