Added a link to "Members" on the homepage.

The members' index page was another story (#39029449) but it ended
up getting done as a side effect of the RSS story.

app/views/home/index.html.haml

@@ -3,4 +3,5 @@
 
 %ul
   %li= link_to "Crops", crops_path
+  %li= link_to "Members", members_path
   %li= link_to "Recent updates", updates_path

spec/views/home/index_spec.rb

@@ -9,6 +9,10 @@ describe 'home/index.html.haml', :type => "view" do
     rendered.should contain 'Crops'
   end
 
+  it 'links to the members page' do
+    rendered.should contain 'Members'
+  end
+
   it 'links to the updates page' do
     rendered.should contain 'Recent updates'
   end