Added 'Up' button in the err view.

.gitignore

@@ -9,6 +9,7 @@ config/deploy
 config/mongoid.yml
 config/newrelic.yml
 .rvmrc
+.idea
 *~
 *.rbc
 .DS_Store

app/views/errs/show.html.haml

@@ -21,6 +21,7 @@
       = link_to 'unlink issue', unlink_issue_app_err_path(@app, @problem), :method => :delete, :confirm => "Unlink err issues?", :class => "unlink-issue"
   - if @problem.unresolved?
     %span= link_to 'resolve', resolve_app_err_path(@app, @problem), :method => :put, :confirm => err_confirm, :class => 'resolve'
+  %span= link_to 'up', (request.env['HTTP_REFERER'] ? :back : app_errs_path(@app)), :class => 'up'
 
 - if Errbit::Config.allow_comments_with_issue_tracker || !@app.issue_tracker_configured? || @problem.comments.any?
   - content_for :comments do

public/stylesheets/application.css

@@ -672,6 +672,11 @@ table.deploys td.when {
   background: transparent url(images/icons/thumbs-up.png) 6px 5px no-repeat;
 }
 
+/* Go Up */
+#action-bar a.up {
+  background: transparent url(images/icons/up.png) 6px 5px no-repeat;
+}
+
 /* Notices Pagination */
 .notice-pagination {
   float: left;

spec/views/errs/show.html.haml_spec.rb

@@ -38,6 +38,24 @@
       resolve_link.should_not =~ /data-confirm=/
     end
 
+    it "should link 'up' to HTTP_REFERER if is set" do
+      url = 'http://localhost:3000/errs'
+      controller.request.env['HTTP_REFERER'] = url
+      render
+      action_bar = String.new(view.instance_variable_get(:@_content_for)[:action_bar])
+      action_bar.should =~ /<span><a href=\"#{url}\" class=\"up\">up<\/a><\/span>/
+    end
+
+    it "should link 'up' to app_errs_path if HTTP_REFERER isn't set'" do
+      controller.request.env['HTTP_REFERER'] = nil
+      problem = Fabricate(:problem_with_comments)
+      assign :problem, problem
+      assign :app, problem.app
+      render
+      action_bar = String.new(view.instance_variable_get(:@_content_for)[:action_bar])
+      action_bar.should =~ /<span><a href=\"#{app_errs_path(problem.app)}\" class=\"up\">up<\/a><\/span>/
+    end
+
   end
 
   describe "content_for :comments with comments disabled for configured issue tracker" do