Feature specs: Navigate via links rather than visits

We want to test the site like a real user, not like someone constantly
changing the URL bar in a browser. Let's have the specs click links.

Author: mamhoff

spec/features/checkout_spec.rb

@@ -80,7 +80,7 @@
       click_link "RoR Mug"
       click_button "Add To Cart"
 
-      visit spree.login_path
+      click_link "Login"
       fill_in "Email", with: user.email
       fill_in "Password", with: user.password
       click_button "Login"
@@ -113,7 +113,7 @@
       click_link "RoR Mug"
       click_button "Add To Cart"
 
-      visit spree.login_path
+      click_link "Login"
       click_link "Forgot Password?"
       fill_in "spree_user_email", with: "email@person.com"
       click_button "Reset my password"

spec/features/order_spec.rb

@@ -20,7 +20,7 @@
       click_link "RoR Mug"
       click_button "Add To Cart"
 
-      visit spree.login_path
+      click_link "Login"
       fill_in "Email", with: user.email
       fill_in "Password", with: user.password
       click_button "Login"
@@ -35,7 +35,7 @@
       click_link "RoR Shirt"
       click_button "Add To Cart"
 
-      visit spree.login_path
+      click_link "Login"
       fill_in "Email", with: user.email
       fill_in "Password", with: user.password
       click_button "Login"