Update gems, use d3 gem, initial bootstrap v3 port

app/views/devise/sessions/new.html.haml

@@ -1,15 +0,0 @@
-.container
-  %h2.text-center
-    Sign In
-  .row-fluid
-    .well.span3.offset2
-      = semantic_form_for(resource, :as => resource_name, :url => session_path(resource_name)) do |f|
-        = f.input :email
-        = f.input :password
-        - if devise_mapping.rememberable?
-          = f.input :remember_me, :as=> :boolean, :label => false
-        = f.action :submit, :as => :button, :label => "Sign In", :button_html => {:class => "btn btn-primary"}
-    .well.span3.offset2
-      %h4
-        No account?
-      = render "devise/shared/links"